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Pension and Other Postretirement Benefit Plans - Obligation 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]      
Non-Current Liabilities $ (210.9) $ (206.8)  
Other Investments 55.6 74.6  
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation 698.8 665.0  
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 709.8 714.5  
Service Cost 8.1 10.1 $ 8.3
Interest Cost 33.2 29.9 29.8
Actuarial (Gain) Loss 12.4 (31.2)  
Benefits Paid (44.5) (40.2)  
Participant Contributions 24.3 26.7  
Obligation, End of Year 743.3 709.8 714.5
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 521.3 544.2  
Actual Return on Plan Assets 48.8 (10.8)  
Employer Contribution [1] 31.9 28.1  
Benefits Paid (44.5) (40.2)  
Fair Value, End of Year 557.5 521.3 544.2
Funded Status, End of Year (185.8) (188.5)  
Current Liabilities (1.4) (1.3)  
Non-Current Liabilities (184.4) (187.2)  
Postretirement Health and Life [Member]      
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 160.2 170.9  
Service Cost 3.9 4.3 3.4
Interest Cost 7.4 7.2 7.3
Actuarial (Gain) Loss 11.9 (14.4)  
Benefits Paid (13.1) (10.7)  
Participant Contributions 3.1 2.9  
Obligation, End of Year 173.4 160.2 170.9
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 153.4 163.2  
Actual Return on Plan Assets 9.6 (3.5)  
Employer Contribution 1.3 1.5  
Participant Contributions 3.1 2.9  
Benefits Paid (13.1) (10.7)  
Fair Value, End of Year 154.3 153.4 $ 163.2
Funded Status, End of Year (19.1) (6.8)  
Non-Current Assets 1.4 6.4  
Current Liabilities (1.1) (1.0)  
Non-Current Liabilities (19.4) (12.2)  
Irrevocable Grantor Trust [Member] | Postretirement Health and Life [Member]      
Change in Plan Assets [Roll Forward]      
Other Investments $ 17.6 $ 17.4  
[1] Includes Participant Contributions noted above.