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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan, Contributions by Employer $ 1.3    
Defined Benefit Plan, Expected Return on Plan Assets 10.5 $ 12.2  
Pension Plan, Defined Benefit [Member] | Scenario, Forecast [Member]      
Defined Benefit Plan, Contributions by Employer     $ 2.9
Other Postretirement Benefit Plan, Defined Benefit [Member]      
Defined Benefit Plan, Expected Return on Plan Assets $ 0.1 $ 0.2  
Other Postretirement Benefit Plan, Defined Benefit [Member] | Scenario, Forecast [Member]      
Defined Benefit Plan, Contributions by Employer     $ 5.4