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Intangible Assets, net (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Intangible assets, net    
Weighted Average Life (in Years) 11 years 1 month 6 days  
Acquired Intangible Assets, Gross $ 126.4 $ 126.4
Accumulated Amortization (54.3) (50.5)
Acquired Intangible Assets, Net $ 72.1 75.9
Covenant not to compete    
Intangible assets, net    
Weighted Average Life (in Years) 2 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) 10 months 24 days  
Acquired Intangible Assets, Gross $ 9.8 9.8
Accumulated Amortization (8.4) (7.8)
Acquired Intangible Assets, Net $ 1.4 2.0
Proprietary know how    
Intangible assets, net    
Weighted Average Life (in Years) 1 year 1 month 6 days  
Acquired Intangible Assets, Gross $ 34.7 34.7
Accumulated Amortization (26.9) (25.0)
Acquired Intangible Assets, Net $ 7.8 9.7
Management contract rights    
Intangible assets, net    
Weighted Average Life (in Years) 12 years 7 months 6 days  
Acquired Intangible Assets, Gross $ 81.0 81.0
Accumulated Amortization (18.1) (16.8)
Acquired Intangible Assets, Net $ 62.9 $ 64.2
Minimum    
Intangible assets, net    
Weighted Average Life (in Years) 1 year  
Maximum    
Intangible assets, net    
Weighted Average Life (in Years) 19 years