Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in Plan Assets [Roll Forward]      
Fair Value of Plan Assets at Previous December 31 [1] $ 736.4    
Fair Value of Plan Assets at December 31 $ 687.9 [2] $ 736.4 [1]  
Amounts Recognized in Consolidated Balance Sheet [Abstract]      
Funded Percentage [3] 74.65003% 71.1154%  
Unfunded, Nonqualified Pension Plan Projected and Accumulated Benefit Obligations Included in Funded Status of the Company's Pension Plans $ 34.5 $ 36.7  
Pension Plans [Member]      
Change in Benefit Obligations [Roll Forward]      
Benefit Obligation at Previous December 31 1,035.5 1,315.4  
Interest Cost 35.8 47.9 $ 58.6
Participant Contributions 0.0 0.0  
Actuarial (Gains) Losses 49.0 (56.8)  
Benefit Payments (73.6) (79.2)  
Settlement Payments (125.2) (191.8)  
Benefit Obligation at December 31 921.5 1,035.5 1,315.4
Change in Plan Assets [Roll Forward]      
Fair Value of Plan Assets at Previous December 31 736.4 965.9  
Actual Return on Plan Assets 75.7 (32.1)  
Employer Contributions 74.6 73.6  
Participant Contributions 0.0 0.0  
Benefit Payments (73.6) (79.2)  
Settlement Payments (125.2) (191.8) (71.9)
Fair Value of Plan Assets at December 31 687.9 736.4 965.9
Amounts Recognized in Consolidated Balance Sheet [Abstract]      
Accrued expenses 10.5 3.8  
Postretirement benefit liabilities 223.1 295.3  
Net amount recognized 233.6 299.1  
Funded Status at December 31 (233.6) (299.1)  
Other Postretirement Benefit Plans [Member]      
Change in Benefit Obligations [Roll Forward]      
Benefit Obligation at Previous December 31 43.5 49.5  
Interest Cost 1.4 1.8 2.0
Participant Contributions 0.5 0.7  
Actuarial (Gains) Losses (0.9) (4.1)  
Benefit Payments (3.9) (4.4)  
Settlement Payments 0.0 0.0  
Benefit Obligation at December 31 40.6 43.5 49.5
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 3.4 3.7  
Participant Contributions 0.5 0.7  
Benefit Payments (3.9) (4.4)  
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 4.1 4.4  
Postretirement benefit liabilities 36.5 39.1  
Net amount recognized 40.6 43.5  
Funded Status at December 31 $ (40.6) $ (43.5)  
[1] (A)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 2015.
[2] (A)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 2016.
[3] (A) As all of the Company's plans are frozen, the projected benefit obligation and the accumulated benefit obligation are equal. As of December 31, 2016 and 2015, the projected and accumulated benefit obligations for all of the Company's pension plans were in excess of plan assets.