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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2019	May 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Nov. 30, 2018	May 01, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Operating lease right-of-use assets			$ 245.7	$ 276.5
Goodwill			2,318.7	2,305.2	$ 2,100.8							$ 1,972.6
Current operating lease liabilities			44.8	40.4
Inpatient Rehabilitation
Business Acquisition [Line Items]
Goodwill			$ 1,228.1	$ 1,218.9	$ 1,189.2							1,166.0
Inpatient Rehabilitation \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Property and equipment						$ 0.1
Goodwill						9.2
Total assets acquired						10.9
Inpatient Rehabilitation \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Property and equipment										$ 0.1
Identifiable intangible assets										12.5
Goodwill										23.2
Total assets acquired										39.5
Total liabilities assumed										0.2
Net assets acquired										39.3
Inpatient Rehabilitation \| Noncompete agreements \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Identifiable intangible assets						0.7
Inpatient Rehabilitation \| Noncompete agreements \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Identifiable intangible assets										1.4
Inpatient Rehabilitation \| Trade names \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Identifiable intangible assets						$ 0.9
Finite-lived intangible asset useful life			20 years
Inpatient Rehabilitation \| Trade names \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				20 years
Inpatient Rehabilitation \| Trade names \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Identifiable intangible assets										$ 2.3
Finite-lived intangible asset useful life					20 years
Inpatient Rehabilitation \| Certificates of need \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life					20 years
Home Health and Hospice
Business Acquisition [Line Items]
Goodwill			$ 1,090.6	$ 1,086.3	$ 911.6							$ 806.6
Home Health and Hospice \| Generation Solutions of Lynchburg
Business Acquisition [Line Items]
Goodwill							$ 1.0
Total assets acquired							1.1
Home Health and Hospice \| Alacare
Business Acquisition [Line Items]
Accounts receivable	$ 10.2
Prepaid expenses and other current assets	1.7
Property and equipment	0.7
Goodwill	163.9
Other long-term assets	5.0
Total assets acquired	232.5
Current portion of long-term debt	0.3
Accounts payable	1.2
Accrued payroll	8.1
Other current liabilities	2.0
Long-term lease liabilities	3.1
Total liabilities assumed	14.7
Net assets acquired	217.8
Home Health and Hospice \| Tidewater and Care Resource Group
Business Acquisition [Line Items]
Operating lease right-of-use assets									$ 0.2
Goodwill									10.8
Total assets acquired									14.0
Current operating lease liabilities									0.1
Accrued payroll									0.1
Long-term lease liabilities									0.1
Total liabilities assumed									0.3
Net assets acquired									13.7
Home Health and Hospice \| Camellia Healthcare
Business Acquisition [Line Items]
Cash and cash equivalents											$ 1.3
Prepaid expenses and other current assets											0.3
Property and equipment											0.6
Goodwill											96.1
Total assets acquired											138.4
Accounts payable											1.7
Accrued payroll											4.0
Total liabilities assumed											5.7
Net assets acquired											132.7
Home Health and Hospice \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Total current assets					0.1
Goodwill					8.9
Total assets acquired					13.2
Total liabilities assumed					0.1
Net assets acquired					13.1
Home Health and Hospice \| Noncompete agreements \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1.0
Finite-lived intangible asset useful life	5 years
Home Health and Hospice \| Noncompete agreements \| Tidewater and Care Resource Group
Business Acquisition [Line Items]
Identifiable intangible assets									0.2
Finite-lived intangible asset useful life				5 years
Home Health and Hospice \| Noncompete agreements \| Camellia Healthcare
Business Acquisition [Line Items]
Identifiable intangible assets											0.5
Finite-lived intangible asset useful life		5 years
Home Health and Hospice \| Noncompete agreements \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Identifiable intangible assets					$ 0.2
Finite-lived intangible asset useful life					5 years
Home Health and Hospice \| Trade names \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1.0
Finite-lived intangible asset useful life	6 months
Home Health and Hospice \| Trade names \| Camellia Healthcare
Business Acquisition [Line Items]
Identifiable intangible assets											1.4
Finite-lived intangible asset useful life		1 year
Home Health and Hospice \| Certificates of need \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 34.3
Finite-lived intangible asset useful life	10 years
Home Health and Hospice \| Certificates of need \| Tidewater and Care Resource Group
Business Acquisition [Line Items]
Identifiable intangible assets									2.0
Finite-lived intangible asset useful life				10 years
Home Health and Hospice \| Certificates of need \| Camellia Healthcare
Business Acquisition [Line Items]
Identifiable intangible assets											16.6
Finite-lived intangible asset useful life		10 years
Home Health and Hospice \| Certificates of need \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Identifiable intangible assets					$ 2.5
Finite-lived intangible asset useful life					10 years
Home Health and Hospice \| Licenses \| Generation Solutions of Lynchburg
Business Acquisition [Line Items]
Identifiable intangible assets							$ 0.1
Finite-lived intangible asset useful life			10 years
Home Health and Hospice \| Licenses \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 14.6
Finite-lived intangible asset useful life	10 years
Home Health and Hospice \| Licenses \| Tidewater and Care Resource Group
Business Acquisition [Line Items]
Identifiable intangible assets									$ 0.8
Finite-lived intangible asset useful life				10 years
Home Health and Hospice \| Licenses \| Camellia Healthcare
Business Acquisition [Line Items]
Identifiable intangible assets											$ 21.6
Finite-lived intangible asset useful life		10 years
Home Health and Hospice \| Licenses \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Identifiable intangible assets					$ 1.5
Finite-lived intangible asset useful life					10 years
Home Health and Hospice \| Software Development \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 0.1
Finite-lived intangible asset useful life	3 years
Minimum \| Noncompete agreements
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			1 year
Minimum \| Trade names
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			1 year
Minimum \| Certificates of need
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Minimum \| Licenses
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Minimum \| Inpatient Rehabilitation \| Noncompete agreements \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			2 years
Minimum \| Inpatient Rehabilitation \| Noncompete agreements \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life					2 years
Maximum \| Noncompete agreements
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			18 years
Maximum \| Trade names
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Maximum \| Certificates of need
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			30 years
Maximum \| Licenses
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Maximum \| Inpatient Rehabilitation \| Noncompete agreements \| Portercare Adventist and Premier Health Partners
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			3 years
Maximum \| Inpatient Rehabilitation \| Noncompete agreements \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				2 years
Maximum \| Inpatient Rehabilitation \| Noncompete agreements \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life					3 years
Corporate Joint Venture \| Inpatient Rehabilitation \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Goodwill								$ 4.8
Total assets acquired								5.3
Total liabilities assumed								0.2
Net assets acquired								5.1
Corporate Joint Venture \| Inpatient Rehabilitation \| Noncompete agreements \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Identifiable intangible assets								0.1
Corporate Joint Venture \| Inpatient Rehabilitation \| Trade names \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Identifiable intangible assets								$ 0.4