Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified
|
12 Months Ended |
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
Postretirement Benefits [Abstract] |
|
|
|
|
|
|
Pension and other postretirement benefit expense |
$ 30.9
|
|
$ 25.0
|
|
$ 24.0
|
|
Contributions to multiemployer plans |
0.5
|
|
0.3
|
|
0.4
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
740.4
|
[1] |
|
|
|
|
Fair value of plan assets, ending |
795.7
|
[2] |
740.4
|
[1] |
|
|
Net Actuarial Losses [Abstract] |
|
|
|
|
|
|
Percentage of benefit obligation or market value of assets, over which actuarial gains and losses are subject to amortization (in hundredths) |
|
|
10.00%
|
|
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Amortization of prior service costs (credits) for former/inactive employees |
1.3
|
|
1.3
|
|
|
|
Estimated pretax prior service credit in Accumulated other comprehensive income (loss) expected to be recognized for former/inactive employees |
1.3
|
|
|
|
|
|
Fair value of plan assets |
795.7
|
[2] |
740.4
|
[1] |
|
|
Expected Benefit Payments [Abstract] |
|
|
|
|
|
|
Company contributions expected to be made in 2012 to the unfunded benefit plans |
4.0
|
|
|
|
|
|
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract] |
|
|
|
|
|
|
Projected benefit obligation |
1,319.3
|
|
1,214.2
|
|
|
|
Accumulated benefit obligation |
1,319.3
|
|
1,214.2
|
|
|
|
Fair value of plan assets |
795.7
|
|
740.4
|
|
|
|
Funded status (in hundredths) |
60.00%
|
|
61.00%
|
|
|
|
Unfunded, nonqualified pension plan projected and accumulated benefit obligations included in funded status of the Company's pension plans |
43.1
|
|
42.0
|
|
|
|
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |
|
|
|
|
|
|
Health care cost trend rate for next year (in hundredths) |
7.60%
|
|
7.80%
|
|
|
|
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (in hundredths) |
4.50%
|
|
4.50%
|
|
|
|
Year rate reaches the ultimate trend rate |
2028
|
|
2028
|
|
|
|
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] |
|
|
|
|
|
|
Effect on total service and interest cost, increase |
0.1
|
|
|
|
|
|
Effect on total service and interest cost, decrease |
(0.1)
|
|
|
|
|
|
Effect on accumulated postretirement benefit obligation, increase |
1.5
|
|
|
|
|
|
Effect on accumulated postretirement benefit obligation, decrease |
(1.3)
|
|
|
|
|
|
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |
|
|
|
|
|
|
United States (in hundredths) |
46.00%
|
|
54.00%
|
|
|
|
International (in hundredths) |
8.00%
|
|
11.00%
|
|
|
|
Fixed-income securities (in hundredths) |
42.00%
|
|
33.00%
|
|
|
|
Short-term investments (in hundredths) |
4.00%
|
|
2.00%
|
|
|
|
Total (in hundredths) |
100.00%
|
|
100.00%
|
|
|
|
Defined Benefit Plan, Assets, Target Allocations [Abstract] |
|
|
|
|
|
|
United States (in hundredths) |
45.00%
|
|
|
|
|
|
International (in hundredths) |
10.00%
|
|
|
|
|
|
Fixed-income securities (in hundredths) |
45.00%
|
|
|
|
|
|
Short-term investments (in hundredths) |
0.00%
|
|
|
|
|
|
Total (in hundredths) |
100.00%
|
|
|
|
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
75.7
|
[2] |
24.9
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
75.7
|
[2] |
24.9
|
[1] |
|
|
Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
724.4
|
[2] |
715.7
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
724.4
|
[2] |
715.7
|
[1] |
|
|
Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
|
|
87.9
|
|
|
|
Fair value of plan assets, ending |
0
|
[2] |
0.9
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2] |
0.9
|
[1] |
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Unrealized gains (losses) |
|
|
18.8
|
|
|
|
Realized gains (losses) |
|
|
(21.4)
|
|
|
|
Purchases, sales and settlements |
|
|
(84.1)
|
|
|
|
Transfers in/(out) |
|
|
(0.3)
|
|
|
|
Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
800.1
|
[2] |
741.5
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
800.1
|
[2] |
741.5
|
[1] |
|
|
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0.1
|
[2] |
0
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0.1
|
[2] |
0
|
[1] |
|
|
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
28.8
|
[2] |
18.3
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
28.8
|
[2] |
18.3
|
[1] |
|
|
Short-term Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2] |
0
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2] |
0
|
[1] |
|
|
Short-term Investments [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
28.9
|
[2] |
18.3
|
[1] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
28.9
|
[2] |
18.3
|
[1] |
|
|
International Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
International Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
65.4
|
[2],[3] |
82.6
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
65.4
|
[2],[3] |
82.6
|
[1],[4] |
|
|
International Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
International Equity Securities [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
65.4
|
[2],[3] |
82.6
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
65.4
|
[2],[3] |
82.6
|
[1],[4] |
|
|
US Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[3] |
0.3
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[3] |
0.3
|
[1],[4] |
|
|
US Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
367.2
|
[2],[3] |
393.2
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
367.2
|
[2],[3] |
393.2
|
[1],[4] |
|
|
US Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
|
|
2.3
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[3] |
0
|
[1],[4] |
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Unrealized gains (losses) |
|
|
0.3
|
|
|
|
Realized gains (losses) |
|
|
0
|
|
|
|
Purchases, sales and settlements |
|
|
(2.3)
|
|
|
|
Transfers in/(out) |
|
|
(0.3)
|
|
|
|
US Equity Securities [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
367.2
|
[2],[3] |
393.5
|
[1],[4] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
367.2
|
[2],[3] |
393.5
|
[1],[4] |
|
|
Government debt securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
75.6
|
[2],[5] |
24.6
|
[1],[6] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
75.6
|
[2],[5] |
24.6
|
[1],[6] |
|
|
Government debt securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
38.0
|
[2],[5] |
25.2
|
[1],[6] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
38.0
|
[2],[5] |
25.2
|
[1],[6] |
|
|
Government debt securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[5] |
0
|
[1],[6] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[5] |
0
|
[1],[6] |
|
|
Government debt securities [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
113.6
|
[2],[5] |
49.8
|
[1],[6] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
113.6
|
[2],[5] |
49.8
|
[1],[6] |
|
|
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[7] |
0
|
[1],[7] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[7] |
0
|
[1],[7] |
|
|
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
98.5
|
[2],[7] |
9.1
|
[1],[7] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
98.5
|
[2],[7] |
9.1
|
[1],[7] |
|
|
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[7] |
0
|
[1],[7] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[7] |
0
|
[1],[7] |
|
|
Corporate Debt Securities [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
98.5
|
[2],[7] |
9.1
|
[1],[7] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
98.5
|
[2],[7] |
9.1
|
[1],[7] |
|
|
Commingled Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[8] |
0
|
[1],[9] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[8] |
0
|
[1],[9] |
|
|
Commingled Funds [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
126.5
|
[2],[8] |
186.7
|
[1],[9] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
126.5
|
[2],[8] |
186.7
|
[1],[9] |
|
|
Commingled Funds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
0
|
[2],[8] |
0
|
[1],[9] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
0
|
[2],[8] |
0
|
[1],[9] |
|
|
Commingled Funds [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
126.5
|
[2],[8] |
186.7
|
[1],[9] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
126.5
|
[2],[8] |
186.7
|
[1],[9] |
|
|
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0
|
[1],[10] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0
|
[1],[10] |
|
|
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0
|
[1],[10] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0
|
[1],[10] |
|
|
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
0.9
|
[1],[10] |
79.8
|
|
|
|
Fair value of plan assets, ending |
|
|
0.9
|
[1],[10] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0.9
|
[1],[10] |
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Unrealized gains (losses) |
|
|
8.3
|
|
|
|
Realized gains (losses) |
|
|
(11.2)
|
|
|
|
Purchases, sales and settlements |
(0.9)
|
|
(76.0)
|
|
|
|
Transfers in/(out) |
|
|
0
|
|
|
|
Real Estate [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0.9
|
[1],[10] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0.9
|
[1],[10] |
|
|
Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0
|
[1],[11] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0
|
[1],[11] |
|
|
Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0.6
|
[1],[11] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0.6
|
[1],[11] |
|
|
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
|
|
5.8
|
|
|
|
Fair value of plan assets, ending |
|
|
0
|
[1],[11] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0
|
[1],[11] |
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Unrealized gains (losses) |
|
|
10.2
|
|
|
|
Realized gains (losses) |
|
|
(10.2)
|
|
|
|
Purchases, sales and settlements |
|
|
(5.8)
|
|
|
|
Transfers in/(out) |
|
|
0
|
|
|
|
Other Investments [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
|
|
0.6
|
[1],[11] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
|
|
0.6
|
[1],[11] |
|
|
Other Pension Plan Assets [Member] | Fair Value [Member]
|
|
|
|
|
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, ending |
(4.4)
|
[12],[2] |
(1.1)
|
[1],[13] |
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Fair value of plan assets |
(4.4)
|
[12],[2] |
(1.1)
|
[1],[13] |
|
|
Pension Plans [Member]
|
|
|
|
|
|
|
Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Service cost |
1.1
|
|
1.1
|
|
9.2
|
|
Interest cost |
62.4
|
|
64.8
|
|
66.4
|
|
Expected return on plan assets |
(53.3)
|
|
(49.5)
|
|
(49.4)
|
|
Amortization of prior service costs (credits) |
0.4
|
|
0.4
|
|
3.6
|
|
Amortization of net actuarial loss |
21.3
|
|
22.2
|
|
52.5
|
|
Curtailment loss |
0.3
|
|
0.1
|
|
12.4
|
|
Settlement loss |
0
|
|
0
|
|
1.5
|
|
Net pension and other benefit costs |
32.2
|
|
39.1
|
|
96.2
|
|
Change in Benefit Obligations [Roll Forward] |
|
|
|
|
|
|
Benefit obligation, beginning balance |
1,214.2
|
|
1,143.8
|
|
|
|
Service cost |
1.1
|
|
1.1
|
|
9.2
|
|
Interest cost |
62.4
|
|
64.8
|
|
66.4
|
|
Participant contributions |
0
|
|
0
|
|
|
|
Actuarial (gains) losses |
113.1
|
|
74.8
|
|
|
|
Benefit payments |
(71.5)
|
|
(70.4)
|
|
|
|
Plan amendments |
0
|
|
0.1
|
|
|
|
Benefit obligation, ending balance |
1,319.3
|
|
1,214.2
|
|
1,143.8
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
740.4
|
|
682.2
|
|
|
|
Actual return on plan assets |
47.2
|
|
91.2
|
|
|
|
Employer contributions |
79.6
|
|
37.4
|
|
|
|
Participant contributions |
0
|
|
0
|
|
|
|
Benefit payments |
(71.5)
|
|
(70.4)
|
|
|
|
Fair value of plan assets, ending |
795.7
|
|
740.4
|
|
682.2
|
|
Funded status, ending |
(523.6)
|
|
(473.8)
|
|
|
|
Amounts Recognized in Consolidated Balance Sheet [Abstract] |
|
|
|
|
|
|
Accrued expenses |
4.0
|
|
4.1
|
|
|
|
Postretirement benefit liabilities |
519.6
|
|
469.7
|
|
|
|
Net amount recognized |
523.6
|
|
473.8
|
|
|
|
Prior Service Costs (Credits) [Abstract] |
|
|
|
|
|
|
Beginning balance |
0.8
|
|
1.2
|
|
|
|
Prior service cost (credit) arising during the period |
0
|
|
0.1
|
|
|
|
Amount recognized as component of net benefit costs |
(0.7)
|
|
(0.5)
|
|
|
|
Ending balance |
0.1
|
|
0.8
|
|
1.2
|
|
Net Actuarial Losses [Abstract] |
|
|
|
|
|
|
Beginning balance |
494.1
|
|
483.2
|
|
|
|
Actuarial losses arising during the period |
119.1
|
|
33.1
|
|
|
|
Amount recognized as component of net benefit costs |
(21.3)
|
|
(22.2)
|
|
|
|
Ending balance |
591.9
|
|
494.1
|
|
|
|
Total |
592.0
|
|
494.9
|
|
|
|
Estimated pretax net actuarial loss in accumulated other comprehensive income (loss) |
21.9
|
|
|
|
|
|
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract] |
|
|
|
|
|
|
Discount rate |
4.50%
|
|
5.30%
|
|
|
|
Rate of compensation increase |
0.00%
|
|
0.00%
|
|
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Discount rate (in hundredths) |
|
|
5.85%
|
[14] |
|
|
Discount rate, lower range (in hundredths) |
5.20%
|
[14] |
|
|
6.00%
|
[14] |
Discount rate, upper range (in hundredths) |
5.30%
|
[14] |
|
|
7.65%
|
[14] |
Long-term rate of return on plan assets (in hundredths) |
7.25%
|
[15] |
7.50%
|
[15] |
8.00%
|
[15] |
Rate of compensation increase (in hundredths) |
0.00%
|
[15] |
0.00%
|
[15] |
0.00%
|
[15] |
Fair value of plan assets |
795.7
|
|
740.4
|
|
682.2
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Company contributions expected to be made in 2012 |
79.0
|
[16] |
|
|
|
|
Expected Benefit Payments [Abstract] |
|
|
|
|
|
|
2012 |
76.1
|
|
|
|
|
|
2013 |
77.9
|
|
|
|
|
|
2014 |
79.6
|
|
|
|
|
|
2015 |
80.9
|
|
|
|
|
|
2016 |
82.0
|
|
|
|
|
|
2017-2021 |
418.0
|
|
|
|
|
|
Company contributions expected to be made in 2012 to the qualified pension plans (required and discretionary) |
75.0
|
|
|
|
|
|
Company contributions expected to be made in 2012 to the unfunded benefit plans |
4.0
|
|
|
|
|
|
Other Postretirement Benefit Plans [Member]
|
|
|
|
|
|
|
Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
|
|
Reductions on benefit obligations due to negative plan amendments |
6.1
|
|
0.8
|
|
11.9
|
|
Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Service cost |
0.2
|
|
0.4
|
|
1.1
|
|
Interest cost |
3.2
|
|
3.9
|
|
4.9
|
|
Expected return on plan assets |
0
|
|
0
|
|
0
|
|
Amortization of prior service costs (credits) |
(5.2)
|
|
(3.9)
|
|
(2.4)
|
|
Amortization of net actuarial loss |
1.0
|
|
0
|
|
0
|
|
Curtailment loss |
0
|
|
0
|
|
0.7
|
|
Settlement loss |
0
|
|
0
|
|
0
|
|
Net pension and other benefit costs |
(0.8)
|
|
0.4
|
|
4.3
|
|
Change in Benefit Obligations [Roll Forward] |
|
|
|
|
|
|
Benefit obligation, beginning balance |
77.8
|
|
76.0
|
|
|
|
Service cost |
0.2
|
|
0.4
|
|
1.1
|
|
Interest cost |
3.2
|
|
3.9
|
|
4.9
|
|
Participant contributions |
(1.7)
|
|
(1.9)
|
|
|
|
Actuarial (gains) losses |
2.8
|
|
6.6
|
|
|
|
Benefit payments |
(9.7)
|
|
(10.2)
|
|
|
|
Plan amendments |
(6.1)
|
|
(0.8)
|
|
|
|
Benefit obligation, ending balance |
69.9
|
|
77.8
|
|
76.0
|
|
Change in Plan Assets [Roll Forward] |
|
|
|
|
|
|
Fair value of plan assets, beginning |
0
|
|
0
|
|
|
|
Actual return on plan assets |
0
|
|
0
|
|
|
|
Employer contributions |
8.0
|
|
8.3
|
|
|
|
Participant contributions |
1.7
|
|
1.9
|
|
|
|
Benefit payments |
(9.7)
|
|
(10.2)
|
|
|
|
Fair value of plan assets, ending |
0
|
|
0
|
|
0
|
|
Funded status, ending |
(69.9)
|
|
(77.8)
|
|
|
|
Amounts Recognized in Consolidated Balance Sheet [Abstract] |
|
|
|
|
|
|
Accrued expenses |
9.2
|
|
10.4
|
|
|
|
Postretirement benefit liabilities |
60.7
|
|
67.4
|
|
|
|
Net amount recognized |
69.9
|
|
77.8
|
|
|
|
Prior Service Costs (Credits) [Abstract] |
|
|
|
|
|
|
Beginning balance |
(23.4)
|
|
(26.5)
|
|
|
|
Prior service cost (credit) arising during the period |
(6.1)
|
|
(0.8)
|
|
|
|
Amount recognized as component of net benefit costs |
5.2
|
|
3.9
|
|
|
|
Ending balance |
(24.3)
|
|
(23.4)
|
|
(26.5)
|
|
Net Actuarial Losses [Abstract] |
|
|
|
|
|
|
Beginning balance |
13.2
|
|
6.6
|
|
|
|
Actuarial losses arising during the period |
2.8
|
|
6.6
|
|
|
|
Amount recognized as component of net benefit costs |
(1.0)
|
|
0
|
|
|
|
Ending balance |
15.0
|
|
13.2
|
|
|
|
Total |
(9.3)
|
|
(10.2)
|
|
|
|
Estimated pretax prior service cost in accumulated other comprehensive income (loss) |
6.2
|
|
|
|
|
|
Estimated pretax net actuarial loss in accumulated other comprehensive income (loss) |
2.2
|
|
|
|
|
|
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract] |
|
|
|
|
|
|
Discount rate |
4.20%
|
|
4.80%
|
|
|
|
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |
|
|
|
|
|
|
Discount rate (in hundredths) |
|
|
5.45%
|
[14] |
|
|
Discount rate, lower range (in hundredths) |
4.65%
|
[14] |
|
|
5.50%
|
[14] |
Discount rate, upper range (in hundredths) |
4.80%
|
[14] |
|
|
7.25%
|
[14] |
Fair value of plan assets |
0
|
|
0
|
|
0
|
|
Actual Return on Plan Assets [Abstract] |
|
|
|
|
|
|
Company contributions expected to be made in 2012 |
9.2
|
[16] |
|
|
|
|
Expected Benefit Payments [Abstract] |
|
|
|
|
|
|
2012 |
9.2
|
|
|
|
|
|
2013 |
7.9
|
|
|
|
|
|
2014 |
6.7
|
|
|
|
|
|
2015 |
6.3
|
|
|
|
|
|
2016 |
6.0
|
|
|
|
|
|
2017-2021 |
$ 24.1
|
|
|
|
|
|
|
|