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Property and Equipment - Components of Capital Lease Equipment (Details) - Service vehicles - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Service vehicles $ 111.0 $ 88.9
Less: Accumulated amortization (34.6) (28.7)
Service vehicles, net $ 76.4 $ 60.2