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Pension and Postretirement Health and Life Benefits Pension and Postretirement Health and Life Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Actuarial (gain) loss from remeasurement, net $ (1.4) $ 29.6  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan, Benefit Obligation 814.6 832.8 $ 961.4
Actuarial (gain) loss from remeasurement, net 19.1 (55.2)  
Defined Benefit Plan, Service Cost 3.8 5.8  
Defined Benefit Plan, Interest Cost 35.4 36.9  
Defined Benefit Plan, Benefits Paid (60.9) (62.1)  
Defined Benefit Plan, Lump Sum Benefits Paid (12.2) (50.6)  
Defined Benefit Plan, Administrative Expenses Paid (3.4) (3.4)  
Defined Benefit Plan, Fair Value of Plan Assets 634.1 656.3 772.4
Defined Benefit Plan, Actual Return on Plan Assets 50.2 (8.0)  
Defined Benefit Plan, Contributions by Employer 4.1 8.0  
Defined Benefit Plan, Funded Status of Plan (180.5) (176.5)  
Amounts Recognized In Current Liabilities (0.6) (4.2)  
Amounts Recognized In Noncurrent Liabilities (179.9) (172.3)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet $ (180.5) $ (176.5)  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.10% 4.50%  
Other Postretirement Benefit Plan, Defined Benefit [Member]      
Defined Benefit Plan, Benefit Obligation $ 192.8 $ 203.5 237.7
Actuarial (gain) loss from remeasurement, net (9.2) (30.2)  
Defined Benefit Plan, Service Cost 0.0 0.2  
Defined Benefit Plan, Interest Cost 8.2 8.8  
Defined Benefit Plan, Benefits Paid (13.3) (13.1)  
Defined Benefit Plan, Lump Sum Benefits Paid 0.0 0.0  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 0.0 0.1  
Defined Benefit Plan, Plan Amendments 3.6    
Defined Benefit Plan, Administrative Expenses Paid 0.0    
Defined Benefit Plan, Fair Value of Plan Assets 7.7 13.8 $ 26.3
Defined Benefit Plan, Actual Return on Plan Assets 0.5 0.4  
Defined Benefit Plan, Contributions by Employer 6.7 0.2  
Defined Benefit Plan, Funded Status of Plan (185.1) (189.7)  
Amounts Recognized In Current Liabilities (13.8)    
Amounts Recognized In Noncurrent Liabilities (171.3) (184.3)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet (185.1) (189.7)  
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit $ (2.6) $ (6.6)  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.90% 4.20%