Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details)

v3.3.1.900
Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in Plan Assets [Roll Forward]      
Fair value of plan assets at previous December 31 [1] $ 965.9    
Fair value of plan assets at December 31 $ 736.4 [2] $ 965.9 [1]  
Amounts Recognized in Consolidated Balance Sheet [Abstract]      
Funded percentage 71.1154% 73.43014%  
Unfunded, nonqualified pension plan projected and accumulated benefit obligations included in funded status of the Company's pension plans $ 36.7 $ 39.7  
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation 1,035.5 1,315.4  
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at previous December 31 1,315.4 1,249.3  
Interest cost 47.9 58.6 $ 54.0
Participant contributions 0.0 0.0  
Actuarial (gains) losses (56.8) 165.9  
Benefit payments (79.2) (86.5)  
Settlement payments (191.8) (71.9)  
Benefit obligation at December 31   1,315.4 1,249.3
Change in Plan Assets [Roll Forward]      
Fair value of plan assets at previous December 31 965.9 956.0  
Actual return on plan assets (32.1) 94.5  
Employer contributions 73.6 73.8  
Participant contributions 0.0 0.0  
Benefit payments (79.2) (86.5)  
Settlement payments (191.8) (71.9)  
Fair value of plan assets at December 31 736.4 965.9 956.0
Amounts Recognized in Consolidated Balance Sheet [Abstract]      
Accrued expenses 3.8 3.8  
Postretirement benefit liabilities 295.3 345.7  
Net amount recognized 299.1 349.5  
Funded status at December 31 (299.1) (349.5)  
Other Postretirement Benefit Plans [Member]      
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at previous December 31 49.5 47.7  
Interest cost 1.8 2.0 1.9
Participant contributions 0.7 0.9  
Actuarial (gains) losses (4.1) 5.0  
Benefit payments (4.4) (6.1)  
Settlement payments 0.0 0.0  
Benefit obligation at December 31 43.5 49.5 47.7
Change in Plan Assets [Roll Forward]      
Fair value of plan assets at previous December 31 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 3.7 5.2  
Participant contributions 0.7 0.9  
Benefit payments (4.4) (6.1)  
Settlement payments 0.0 0.0  
Fair value of plan assets at December 31 0.0 0.0 $ 0.0
Amounts Recognized in Consolidated Balance Sheet [Abstract]      
Accrued expenses 4.4 4.9  
Postretirement benefit liabilities 39.1 44.6  
Net amount recognized 43.5 49.5  
Funded status at December 31 $ (43.5) $ (49.5)  
[1] See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1, Level 2 and Level 3 in 2013.
[2] See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1, Level 2 and Level 3 in 2014.