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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 01, 2021
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 2,417.6 $ 2,318.7
Inpatient Rehabilitation Segment | Shannon Medical, Heritage Valley Health System And ECHD Ventures      
Business Acquisition [Line Items]      
Goodwill   8.8  
Other long-term assets   0.1  
Total assets acquired   10.2  
Inpatient Rehabilitation Segment | Noncompete agreements | Shannon Medical, Heritage Valley Health System And ECHD Ventures      
Business Acquisition [Line Items]      
Identifiable intangible assets   $ 1.0  
Inpatient Rehabilitation Segment | Noncompete agreements | Shannon Medical, Heritage Valley Health System And ECHD Ventures | Minimum      
Liabilities assumed:      
Finite-lived intangible asset useful life   3 years  
Inpatient Rehabilitation Segment | Noncompete agreements | Shannon Medical, Heritage Valley Health System And ECHD Ventures | Maximum      
Liabilities assumed:      
Finite-lived intangible asset useful life   5 years  
Inpatient Rehabilitation Segment | Trade name | Shannon Medical, Heritage Valley Health System And ECHD Ventures      
Business Acquisition [Line Items]      
Identifiable intangible assets   $ 0.3  
Liabilities assumed:      
Finite-lived intangible asset useful life   20 years  
Home Health and Hospice | Frontier Home Health and Hospice      
Business Acquisition [Line Items]      
Cash and cash equivalents $ 0.8    
Accounts receivable, net 0.9    
Prepaid expenses and other current assets 0.2    
Property and equipment 0.1    
Operating lease right-of-use-assets 0.9    
Goodwill 90.1    
Total assets acquired 102.8    
Liabilities assumed:      
Current operating lease liabilities 0.3    
Accounts payable 0.2    
Accrued payroll 0.8    
Other current liabilities 0.7    
Long-term operating lease liabilities 0.7    
Total liabilities assumed 2.7    
Noncontrolling interests 1.6    
Net assets acquired 98.5    
Home Health and Hospice | Noncompete agreements | Frontier Home Health and Hospice      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 1.7    
Liabilities assumed:      
Finite-lived intangible asset useful life 5 years    
Home Health and Hospice | Trade name | Frontier Home Health and Hospice      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 0.2    
Liabilities assumed:      
Finite-lived intangible asset useful life 3 months    
Home Health and Hospice | Certificate of need | Frontier Home Health and Hospice      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 3.1    
Liabilities assumed:      
Finite-lived intangible asset useful life 10 years    
Home Health and Hospice | Licenses | Frontier Home Health and Hospice      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 4.8    
Liabilities assumed:      
Finite-lived intangible asset useful life 10 years