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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 574.4 $ 522.4
Less: accumulated depreciation and amortization (288.1) (250.4)
Property and equipment, net 286.3 272.0
Land and buildings    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 123.5 115.1
Service vehicles    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 260.4 242.6
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 74.4 63.4
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 25.7 21.6
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 58.4 47.8
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 11.8 8.2
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 20.2 $ 23.7