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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, 2016
USD ($)
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 60.4
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 59.4
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 58.0
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 56.1
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 55.0
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 258.9
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 21.5
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 20.4
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 19.0
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 17.2
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 15.8
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter $ 61.3