Annual report pursuant to Section 13 and 15(d)

Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details)

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Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Reasonably possible decrease in unrecognized tax benefits in 2013 $ 19.6    
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Income tax provision (benefit) at 35 percent 63.4 38.7 (13.3)
State and local income taxes, net of Federal income tax effect 0.1 (0.1) (5.5)
Deferred tax asset valuation allowance (31.2) (6.1) 62.7
Income attributable to domestic production activities (2.8) 0 0
Asset dispositions and write-offs 0 (13.1) (2.1)
Change in estimates related to prior years and prior years amended tax return filings (1.4) (0.4) 1.1
Federal and state tax credits (0.3) (5.9) (21.3)
Taxes related to foreign income, net of credits 4.9 2.0 8.0
Taxes related to unremitted earnings (3.4) 6.8 (5.3)
Tax reserve reassessment 3.8 (5.8) 0.2
Other 0.5 4.0 1.4
Total provision (benefit) 33.6 20.1 25.9
Effective tax rate 18.60% 18.20% (68.00%)
Federal statutory tax rate 35.00% 35.00% 35.00%
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]      
Continuing operations 33.6 20.1 25.9
Discontinued operations 0.7 (2.7) 0
Total tax provision $ 34.3 $ 17.4 $ 25.9