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Other Intangible Assets, net - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Intangible assets, net    
Weighted Average Life (in Years) 10 years 7 months 6 days  
Acquired Intangible Assets, Gross $ 126.3 $ 126.3
Accumulated Amortization (73.5) (72.2)
Acquired Intangible Assets, Net $ 52.8 54.1
Covenant not to compete    
Intangible assets, net    
Weighted Average Life (in Years) 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) 1 year 3 months 18 days  
Acquired Intangible Assets, Gross $ 9.8 9.8
Accumulated Amortization (9.7) (9.7)
Acquired Intangible Assets, Net $ 0.1 0.1
Proprietary know how    
Intangible assets, net    
Weighted Average Life (in Years) 1 year 3 months 18 days  
Acquired Intangible Assets, Gross $ 34.6 34.6
Accumulated Amortization (34.5) (34.5)
Acquired Intangible Assets, Net $ 0.1 0.1
Management contract rights    
Intangible assets, net    
Weighted Average Life (in Years) 10 years 8 months 12 days  
Acquired Intangible Assets, Gross $ 81.0 81.0
Accumulated Amortization (28.4) (27.1)
Acquired Intangible Assets, Net $ 52.6 $ 53.9
Minimum    
Intangible assets, net    
Weighted Average Life (in Years) 1 year  
Maximum    
Intangible assets, net    
Weighted Average Life (in Years) 14 years