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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 59.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 58.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 56.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 54.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 53.7
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 251.8
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 16.4
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 15.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 14.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 13.4
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 12.8
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 53.1