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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)
$ in Millions
Dec. 31, 2015
USD ($)
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 65.8
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 60.5
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 59.8
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 57.4
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 57.5
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 266.6
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 19.2
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 20.0
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 21.0
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 19.8
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 18.3
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter $ 70.5