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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 1,971.7 $ 1,927.2
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]    
Business Acquisition [Line Items]    
Property and equipment 0.1  
Goodwill 24.0  
Total assets acquired 35.0  
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Noncompete Agreements [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 0.6  
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Trade Names [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 0.5  
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member] | Certificate of Need [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 9.8  
Home Health and Hospice Segment [Member]    
Business Acquisition [Line Items]    
Net assets acquired 25.7  
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member]    
Business Acquisition [Line Items]    
Total current assets 0.1  
Goodwill 20.5  
Total assets acquired 25.9  
Total liabilities assumed 0.2  
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Noncompete Agreements [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 0.7  
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Trade Names [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 0.1  
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | Certificate of Need [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets 0.7  
Home Health and Hospice Segment [Member] | Celtic, Community, Bio Care, and VNA [Member] | License [Member]    
Business Acquisition [Line Items]    
Identifiable intangible assets $ 3.8