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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Actuarial Gain (Loss) $ 0.8 $ 3.9        
Pension Plan, Defined Benefit [Member]            
Defined Benefit Plan, Actuarial Gain (Loss) $ (0.8) $ 3.9 $ (0.8) $ 3.9    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.70% 4.50% 3.70% 4.50% 4.50% 4.10%
Defined Benefit Plan, Expected Return on Plan Assets $ 10.5 $ 12.2 $ 21.0 $ 24.4    
Other Postretirement Benefit Plan [Member]            
Defined Benefit Plan, Expected Return on Plan Assets   $ 0.3 $ 0.1 $ 0.5