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Leasehold Improvements, Equipment, Land and Construction in Progress, net - Schedule of Leasehold Improvements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 104.6 $ 103.8
Less accumulated depreciation and amortization (77.2) (72.9)
Leasehold improvements, equipment, land and construction in progress, net 27.4 30.9
Equipment    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 39.6 38.6
Equipment | Minimum    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 1 year  
Equipment | Maximum    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 10 years  
Software    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 3 years  
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 31.9 30.9
Vehicles    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 9.1 8.8
Vehicles | Minimum    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 1 year  
Vehicles | Maximum    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 10 years  
Other    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 3 years  
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 0.5 0.5
Leasehold improvements    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 20.8 21.7
Leasehold improvements | Maximum    
Leasehold Improvements, Equipment, Land and Construction in Progress, net    
Ranges of estimated useful life 10 years  
Construction in progress    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net    
Leasehold improvements, equipment and construction in progress, gross $ 2.7 $ 3.3