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Pension and Postretirement Health and Life Benefits Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Prescription Drug Subsidy Receipts, Next Twelve Months $ 0.2
Prescription Drug Subsidy Receipts, Year Two 0.2
Prescription Drug Subsidy Receipts, Year Three 0.2
Prescription Drug Subsidy Receipts, Year Four 0.3
Prescription Drug Subsidy Receipts, Year Five 0.3
Prescription Drug Subsidy Receipts, after Year Five 2.0
Pension Plan, Defined Benefit [Member]
  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 85.8
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 64.1
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 73.0
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 62.2
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 61.4
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 291.5
Other Postretirement Benefit Plan, Defined Benefit [Member]
  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 16.3
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 20.9
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 24.1
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 24.6
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 23.9
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter $ 98.2