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Employee Benefit Plans and Other Postretirement Plans - Change in Benefit Obligations and Change in Fair Value of Plan Assets Related to Pension and Postretirement Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value at beginning of period $ 764,400,000    
Company contributions 57,100,000 $ 57,100,000 $ 400,000
Fair value of plan assets at plan year end 830,400,000 764,400,000  
Amounts Recognized on Consolidated Balance Sheets      
Noncurrent liabilities (357,200,000) $ (358,600,000)  
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-Tax)      
Accumulated benefit obligation for plans with obligations in excess of plan assets $ 1,000,000,000    
Pension Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate 4.24% 4.51% 4.14%
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at beginning of period $ 1,092,500,000 $ 1,129,600,000  
Service cost 24,500,000 24,000,000 $ 22,700,000
Interest cost 40,900,000 46,200,000 45,900,000
Plan amendments 1,800,000 3,000,000  
Actuarial (gain) loss [1] 35,300,000 (75,700,000)  
Special termination benefits 0 0 (300,000)
Participant contributions 0 0  
Benefits paid (36,600,000) (34,600,000)  
Benefit obligation at plan year end 1,158,400,000 1,092,500,000 1,129,600,000
Accumulated benefit obligation portion of above 1,116,600,000 1,048,500,000  
Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value at beginning of period 764,400,000 805,900,000  
Actual return on plan assets 44,400,000 (8,100,000)  
Company contributions 58,200,000 1,200,000  
Participant contributions 0 0  
Benefits paid (36,600,000) (34,600,000)  
Fair value of plan assets at plan year end 830,400,000 764,400,000 $ 805,900,000
Underfunded status (328,000,000) (328,100,000)  
Amounts Recognized on Consolidated Balance Sheets      
Current liabilities (1,300,000) (900,000)  
Noncurrent liabilities (326,700,000) (327,200,000)  
Accrued obligation recognized at December 31 (328,000,000) (328,100,000)  
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-Tax)      
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-Tax) 21,100,000 25,100,000  
Actuarial loss (gain) 183,900,000 149,400,000  
Total $ 205,000,000 $ 174,500,000  
Postretirement Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Weighted-Average Assumptions Used to Determine Benefit Obligation, Discount Rate 3.91% 4.35% 3.95%
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at beginning of period $ 21,400,000 $ 31,900,000  
Service cost 500,000 1,700,000 $ 1,600,000
Interest cost 600,000 1,200,000 1,200,000
Plan amendments (5,300,000) 0  
Actuarial (gain) loss [1] 3,700,000 (11,400,000)  
Special termination benefits 0 0 0
Participant contributions 1,300,000 1,200,000  
Benefits paid (2,700,000) (3,200,000)  
Benefit obligation at plan year end 19,500,000 21,400,000 31,900,000
Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets at fair value at beginning of period 0 0  
Actual return on plan assets 0 0  
Company contributions 1,400,000 2,000,000  
Participant contributions 1,300,000 1,200,000  
Benefits paid (2,700,000) (3,200,000)  
Fair value of plan assets at plan year end 0 0 $ 0
Underfunded status (19,500,000) (21,400,000)  
Amounts Recognized on Consolidated Balance Sheets      
Current liabilities (1,200,000) (1,100,000)  
Noncurrent liabilities (18,300,000) (20,300,000)  
Accrued obligation recognized at December 31 (19,500,000) (21,400,000)  
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-Tax)      
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-Tax) (5,000,000) 200,000  
Actuarial loss (gain) (1,900,000) (6,000,000)  
Total $ (6,900,000) $ (5,800,000)  
[1] The actuarial loss in 2016 was due primarily to a decrease in the weighted average discount rate used to estimate our pension benefit obligations, and updated mortality assumptions from the Society of Actuaries. In 2015, the increase in the weighted average discount rate used to estimate our pension benefit obligations and changes in mortality assumptions from the Society of Actuaries resulted in an actuarial gain.