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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, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
        
Defined Benefit Plan, Benefit Obligation   $ 907.4 $ 1,099.0 $ 989.5
Defined Benefit Plan, Actuarial Gain (Loss)   (121.0) 104.6  
Defined Benefit Plan, Service Cost   9.9 14.6 16.2
Defined Benefit Plan, Interest Cost   45.0 48.3 50.3
Defined Benefit Plan, Benefits Paid   (58.2) (58.0)  
Defined Benefit Plan, Lump Sum Benefits Paid   (47.2) 0  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received   0 0  
Defined Benefit Plan, Plan Amendments   0 0  
Defined Benefit Plan, Curtailments (32.7) (20.1) 0  
Defined Benefit Plan, Special Termination Benefits   0 0 0
Defined Benefit Plan, Fair Value of Plan Assets   784.0 774.8 727.8
Defined Benefit Plan, Actual Return on Plan Assets   92.7 91.3  
Defined Benefit Plan, Contributions by Employer   21.9 13.7  
Defined Benefit Plan, Funded Status of Plan   (123.4) (324.2)  
Amounts Recognized In Current Liabilities   (2.2) (2.5)  
Amounts Recognized In Noncurrent Liabilities   (121.2) (321.7)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet   (123.4) (324.2)  
Amounts Recognized In Accumulated Other Comprehensive Income Pre Tax Net Actuarial Loss   115.3 326.0  
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit   0.2 1.7  
AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTax   115.5 327.7  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.87% 4.07%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase   2.00% 4.00%  
Other Postretirement Benefit Plan, Defined Benefit [Member]
        
Defined Benefit Plan, Benefit Obligation   231.9 248.8 252.9
Defined Benefit Plan, Actuarial Gain (Loss)   (25.2) (7.2)  
Defined Benefit Plan, Service Cost   3.6 3.7 4.3
Defined Benefit Plan, Interest Cost   9.0 11.1 12.2
Defined Benefit Plan, Benefits Paid   (12.2) (12.3)  
Defined Benefit Plan, Lump Sum Benefits Paid   0 0  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received   0.5 0.6  
Defined Benefit Plan, Plan Amendments   (27.8) 0  
Defined Benefit Plan, Curtailments   24.6 0  
Defined Benefit Plan, Special Termination Benefits   10.6 0 0
Defined Benefit Plan, Fair Value of Plan Assets   36.9 41.6 45.1
Defined Benefit Plan, Actual Return on Plan Assets   6.9 5.8  
Defined Benefit Plan, Contributions by Employer   0.6 3.0  
Defined Benefit Plan, Funded Status of Plan   (195.0) (207.2)  
Amounts Recognized In Current Liabilities   0 0  
Amounts Recognized In Noncurrent Liabilities   (195.0) (207.2)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet   (195.0) (207.2)  
Amounts Recognized In Accumulated Other Comprehensive Income Pre Tax Net Actuarial Loss   12.8 45.3  
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit   (2.1) 0  
AmountsRecognizedInAccumulatedOtherComprehensiveIncomePreTax   $ 10.7 $ 45.3  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.45% 3.66%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase   2.00% 4.00%