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Other Intangible Assets, net - Summary of Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 10 years 10 months 24 days  
Acquired Intangible Assets, Gross $ 126.3 $ 126.4
Accumulated Amortization (72.2) (65.1)
Acquired Intangible Assets, Net $ 54.1 61.3
Covenant not to compete    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 1 year  
Acquired Intangible Assets, Gross $ 0.9 0.9
Accumulated Amortization (0.9) (0.9)
Acquired Intangible Assets, Net $ 0.0 0.0
Trade names and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 1 year 6 months  
Acquired Intangible Assets, Gross $ 9.8 9.8
Accumulated Amortization (9.7) (9.6)
Acquired Intangible Assets, Net $ 0.1 0.2
Proprietary know how    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 1 year 6 months  
Acquired Intangible Assets, Gross $ 34.6 34.7
Accumulated Amortization (34.5) (32.6)
Acquired Intangible Assets, Net $ 0.1 2.1
Management contract rights    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 10 years 10 months 24 days  
Acquired Intangible Assets, Gross $ 81.0 81.0
Accumulated Amortization (27.1) (22.0)
Acquired Intangible Assets, Net $ 53.9 $ 59.0
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 1 year  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life (Years) 14 years