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Pension and Other Postretirement Benefits (Schedule of Benefit Obligations in Excess of Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 2,084.1 $ 2,422.5  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation 1,965.6 2,170.4  
Defined Benefit Plan, Benefit Obligation 1,981.3 2,192.6 [1] $ 2,165.8 [1]
Defined Benefit Plan, Plan Assets, Amount 1,867.7 2,160.0 $ 1,750.9
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (113.6) $ (32.6)  
[1] The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in accumulated postretirement benefit obligation.