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Other Operating Credits and Charges, Net (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Operating Credits And Charges, Net [Abstract]          
Other operating charges and credits, net $ 0.0 $ 11.6 $ 0.6 $ 11.6 $ 0.6
Accrual for Environmental Loss Contingencies, Provision for New Losses     (0.5)    
Adjustment to contingent consideration fair value     $ (0.1)   $ 0.1