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Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets, finite-lived $ 29.3    
Asset impairment   $ 4.4  
Revenue earning equipment, net   2,374.6 $ 2,390.0
Internally developed software      
Finite-Lived Intangible Assets [Line Items]      
Impairment of intangible assets, finite-lived   25.3  
Prepaid Expenses and Other Current Assets      
Finite-Lived Intangible Assets [Line Items]      
Revenue earning equipment, net   $ 4.3