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Leasehold Improvements, Equipment, Land and Construction in Progress, net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leasehold Improvements, Equipment, Land and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 103.8 $ 94.4  
Less accumulated depreciation and amortization (72.9) (59.8)  
Leasehold improvements, equipment, land and construction in progress, net 30.9 34.6  
Depreciation expense 16.2 15.9 $ 12.0
Equipment      
Leasehold Improvements, Equipment, Land and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 38.6 34.5  
Equipment | Minimum      
Leasehold Improvements, Equipment, Land and Construction in Progress, net      
Ranges of estimated useful life 2 years    
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      
Leasehold improvements, equipment and construction in progress, gross $ 30.9 27.0  
Software | Minimum      
Leasehold Improvements, Equipment, Land and Construction in Progress, net      
Ranges of estimated useful life 3 years    
Software | Maximum      
Leasehold Improvements, Equipment, Land and Construction in Progress, net      
Ranges of estimated useful life 10 years    
Vehicles      
Leasehold Improvements, Equipment, Land and Construction in Progress, net      
Ranges of estimated useful life 4 years    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 8.8 8.7  
Other      
Leasehold Improvements, Equipment, Land and Construction in Progress, net      
Ranges of estimated useful life 10 years    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 0.5 0.4  
Leasehold improvements      
Leasehold Improvements, Equipment, Land and Construction in Progress, Net      
Leasehold improvements, equipment and construction in progress, gross $ 21.7 20.2  
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 $ 3.3 $ 3.6