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Other Intangible Assets, net - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Intangible assets, net    
Weighted Average Life (in Years) 11 years 7 months 6 days  
Acquired Intangible Assets, Gross $ 126.4 $ 126.4
Accumulated Amortization (71.0) (65.1)
Acquired Intangible Assets, Net $ 55.4 61.3
Covenant not to compete    
Intangible assets, net    
Weighted Average Life (in Years) 1 year 9 months 18 days  
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    
Intangible assets, net    
Weighted Average Life (in Years) 2 years 3 months 18 days  
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    
Intangible assets, net    
Weighted Average Life (in Years) 2 years 3 months 18 days  
Acquired Intangible Assets, Gross $ 34.7 34.7
Accumulated Amortization (34.6) (32.6)
Acquired Intangible Assets, Net $ 0.1 2.1
Management contract rights    
Intangible assets, net    
Weighted Average Life (in Years) 11 years 8 months 12 days  
Acquired Intangible Assets, Gross $ 81.0 81.0
Accumulated Amortization (25.8) (22.0)
Acquired Intangible Assets, Net $ 55.2 $ 59.0
Minimum    
Intangible assets, net    
Weighted Average Life (in Years) 1 year  
Maximum    
Intangible assets, net    
Weighted Average Life (in Years) 19 years