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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   3.70%   3.70% 4.50%
Pension Plan, Defined Benefit [Member]          
Defined Benefit Plan, Actuarial Loss From Remeasurement $ 0.0 $ (0.8) $ 0.0 $ (0.8)  
Selling, General and Administrative Expenses [Member]          
Defined Benefit Plan, Actuarial Loss From Remeasurement   $ 0.8