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Commitment and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2015
Decontamination and decommissioning obligations   $ 22.6    
ARO financial assurance   29.4    
Termination benefit costs $ 8.7 $ 3.7 $ 4.5 $ 13.6