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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount $ 708.3 $ 667.2
Accumulated Amortization (305.2) (255.9)
Net 403.1 411.3
Certificates of need [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 113.7 98.6
Accumulated Amortization (19.5) (12.9)
Net 94.2 85.7
Licenses [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 146.0 142.0
Accumulated Amortization (71.6) (62.1)
Net 74.4 79.9
Noncompete agreements [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 63.5 62.2
Accumulated Amortization (55.4) (47.3)
Net 8.1 14.9
Trade Name - Encompass [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 135.2 135.2
Accumulated Amortization 0.0 0.0
Net 135.2 135.2
Trade names [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 35.1 34.6
Accumulated Amortization (16.4) (13.9)
Net 18.7 20.7
Internal-use Software [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 201.6 181.4
Accumulated Amortization (132.3) (110.2)
Net 69.3 71.2
Market access assets [Member]    
Schedule of Intangible Assets by Major Class    
Gross Carrying Amount 13.2 13.2
Accumulated Amortization (10.0) (9.5)
Net $ 3.2 $ 3.7