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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	May 01, 2018	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Operating lease right-of-use assets			$ 276.5
Goodwill			2,305.2	$ 2,100.8	$ 1,972.6	$ 1,927.2
Current operating lease liabilities			40.4
Home Health and Hospice Segment
Business Acquisition [Line Items]
Goodwill			1,086.3	911.6	806.6	785.2
Home Health and Hospice Segment \| 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 operating lease liabilities		3.1
Total liabilities assumed		(14.7)
Net assets acquired		217.8
Home Health and Hospice Segment \| 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 operating lease liabilities			0.1
Total liabilities assumed			(0.3)
Net assets acquired			13.7
Home Health and Hospice Segment \| 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
Other long-term assets	138.4
Accounts payable	1.7
Accrued payroll	4.0
Total liabilities assumed	(5.7)
Net assets acquired	132.7
Home Health and Hospice Segment \| Celtic, Community, Bio Care, VNA, Ware, and Pickens County
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 Segment \| Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Total current assets					0.1
Goodwill					21.4
Total assets acquired					28.2
Total liabilities assumed					(0.3)
Net assets acquired					27.9
Home Health and Hospice Segment \| Noncompete agreements \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				5 years
Home Health and Hospice Segment \| Noncompete agreements \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets		$ 1.0
Finite-lived intangible asset useful life		5 years
Home Health and Hospice Segment \| 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 Segment \| 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 Segment \| Noncompete agreements \| Celtic, Community, Bio Care, VNA, Ware, and Pickens County
Business Acquisition [Line Items]
Identifiable intangible assets				$ 0.2
Home Health and Hospice Segment \| Noncompete agreements \| Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Identifiable intangible assets					$ 0.8
Finite-lived intangible asset useful life					5 years
Home Health and Hospice Segment \| Trade names \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets		$ 1.0
Finite-lived intangible asset useful life		6 months
Home Health and Hospice Segment \| 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 Segment \| Trade names \| Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Identifiable intangible assets					$ 0.1
Finite-lived intangible asset useful life					1 year
Home Health and Hospice Segment \| Certificates of need \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				10 years
Home Health and Hospice Segment \| 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 Segment \| 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 Segment \| 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 Segment \| Certificates of need \| Celtic, Community, Bio Care, VNA, Ware, and Pickens County
Business Acquisition [Line Items]
Identifiable intangible assets				$ 2.5
Home Health and Hospice Segment \| Certificates of need \| Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Identifiable intangible assets					$ 1.8
Finite-lived intangible asset useful life					10 years
Home Health and Hospice Segment \| Licenses \| Golden Age, MSA and Tenet
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				10 years
Home Health and Hospice Segment \| Licenses \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets		$ 14.6
Finite-lived intangible asset useful life		10 years
Home Health and Hospice Segment \| 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 Segment \| Licenses \| Camellia Healthcare
Business Acquisition [Line Items]
Identifiable intangible assets	$ 21.6
Finite-lived intangible asset useful life	10 years
Home Health and Hospice Segment \| Licenses \| Celtic, Community, Bio Care, VNA, Ware, and Pickens County
Business Acquisition [Line Items]
Identifiable intangible assets				$ 1.5
Home Health and Hospice Segment \| Licenses \| Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Identifiable intangible assets					$ 4.0
Finite-lived intangible asset useful life					10 years
Home Health and Hospice Segment \| Software Development \| Alacare
Business Acquisition [Line Items]
Identifiable intangible assets		$ 0.1
Finite-lived intangible asset useful life		3 years
Inpatient Rehabilitation
Business Acquisition [Line Items]
Goodwill			$ 1,218.9	$ 1,189.2	$ 1,166.0	$ 1,142.0
Inpatient Rehabilitation \| Hot Springs, Bryan and Broken Arrow
Business Acquisition [Line Items]
Property and equipment					0.1
Identifiable intangible assets					9.8
Goodwill					24.0
Total assets acquired					35.0
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
Inpatient Rehabilitation \| Noncompete agreements \| Hot Springs, Bryan and Broken Arrow
Business Acquisition [Line Items]
Identifiable intangible assets					0.6
Inpatient Rehabilitation \| Noncompete agreements \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Identifiable intangible assets			$ 0.1
Finite-lived intangible asset useful life			2 years
Inpatient Rehabilitation \| Trade names \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				20 years
Inpatient Rehabilitation \| Trade names \| Hot Springs, Bryan and Broken Arrow
Business Acquisition [Line Items]
Identifiable intangible assets					$ 0.5
Finite-lived intangible asset useful life					20 years
Inpatient Rehabilitation \| Trade names \| Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Identifiable intangible assets			$ 0.4
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
Inpatient Rehabilitation \| Certificates of need \| Hot Springs, Bryan and Broken Arrow
Business Acquisition [Line Items]
Finite-lived intangible asset useful life					20 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 \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				2 years
Minimum \| Inpatient Rehabilitation \| Noncompete agreements \| Hot Springs, Bryan and Broken Arrow
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 \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				3 years
Maximum \| Inpatient Rehabilitation \| Noncompete agreements \| Hot Springs, Bryan and Broken Arrow
Business Acquisition [Line Items]
Finite-lived intangible asset useful life					3 years
Corporate Joint Venture \| Inpatient Rehabilitation \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Property and equipment				$ 0.1
Goodwill				23.2
Total assets acquired				39.5
Total liabilities assumed				(0.2)
Net assets acquired				39.3
Corporate Joint Venture \| Inpatient Rehabilitation \| Noncompete agreements \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Identifiable intangible assets				1.4
Corporate Joint Venture \| Inpatient Rehabilitation \| Trade names \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Identifiable intangible assets				2.3
Corporate Joint Venture \| Inpatient Rehabilitation \| Certificates of need \| Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Identifiable intangible assets				$ 12.5