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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement Of Cash Flows [Abstract]    
Non cash retirement of assets related to lease finance obligations $ 5.9 $ 11.6
Non cash extinguishment of related lease finance obligation 5.9 11.6
Equipment purchased and financed through capital lease obligations $ 9.9 $ 5.3