v3.8.0.1
Property and Equipment, Net - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense on property and equipment $ 149.7 $ 144.1 $ 154.9
Assets leased under capital leases, net 193.6 166.6  
Accumulated depreciation and amortization $ 63.0 $ 43.7