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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions		12 Months Ended
	May 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 2,100.8	$ 1,972.6	$ 1,927.2	$ 1,890.1
Home Health and Hospice Segment [Member]
Business Acquisition [Line Items]
Goodwill		911.6	806.6	785.2	757.0
Home Health and Hospice Segment [Member] | Camellia Healthcare [Member]
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 Segment [Member] | Golden Age, MSA and Tenet [Member]
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 [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]
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 [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Goodwill				41.4
Total assets acquired				48.5
Total liabilities assumed				0.4
Net assets acquired				48.1
Home Health and Hospice Segment [Member] | Noncompete agreements [Member] | Camellia Healthcare [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life	$ 0.5
Finite-lived intangible asset useful life	5 years
Home Health and Hospice Segment [Member] | Noncompete agreements [Member] | Golden Age, MSA and Tenet [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		$ 0.2
Finite-lived intangible asset useful life		5 years
Home Health and Hospice Segment [Member] | Noncompete agreements [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 0.8
Finite-lived intangible asset useful life			5 years
Home Health and Hospice Segment [Member] | Noncompete agreements [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 1.1
Finite-lived intangible asset useful life				5 years
Home Health and Hospice Segment [Member] | Trade names [Member] | Camellia Healthcare [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life	$ 1.4
Finite-lived intangible asset useful life	1 year
Home Health and Hospice Segment [Member] | Trade names [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 0.1
Finite-lived intangible asset useful life			1 year
Home Health and Hospice Segment [Member] | Trade names [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 0.7
Finite-lived intangible asset useful life				1 year
Home Health and Hospice Segment [Member] | Certificates of need [Member] | Camellia Healthcare [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life	$ 16.6
Finite-lived intangible asset useful life	10 years
Home Health and Hospice Segment [Member] | Certificates of need [Member] | Golden Age, MSA and Tenet [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		$ 2.5
Finite-lived intangible asset useful life		10 years
Home Health and Hospice Segment [Member] | Certificates of need [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 1.8
Finite-lived intangible asset useful life			10 years
Home Health and Hospice Segment [Member] | Certificates of need [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 1.9
Finite-lived intangible asset useful life				10 years
Home Health and Hospice Segment [Member] | Licenses [Member] | Camellia Healthcare [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life	$ 21.6
Finite-lived intangible asset useful life	10 years
Home Health and Hospice Segment [Member] | Licenses [Member] | Golden Age, MSA and Tenet [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		$ 1.5
Finite-lived intangible asset useful life		10 years
Home Health and Hospice Segment [Member] | Licenses [Member] | Celtic, Community, Bio Care, VNA, Ware, and Pickens County [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 4.0
Finite-lived intangible asset useful life			10 years
Home Health and Hospice Segment [Member] | Licenses [Member] | Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 3.4
Finite-lived intangible asset useful life				10 years
Inpatient Rehabilitation Segment [Member]
Business Acquisition [Line Items]
Goodwill		$ 1,189.2	$ 1,166.0	$ 1,142.0	$ 1,133.1
Inpatient Rehabilitation Segment [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
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
Inpatient Rehabilitation Segment [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Goodwill			$ 24.0
Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member]
Business Acquisition [Line Items]
Property and equipment				5.3
Goodwill				9.4
Total assets acquired				16.1
Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		1.4
Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Hot Springs, Bryan and Broken Arrow [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				0.4
Inpatient Rehabilitation Segment [Member] | Trade names [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		$ 2.3
Finite-lived intangible asset useful life		20 years
Inpatient Rehabilitation Segment [Member] | Trade names [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Inpatient Rehabilitation Segment [Member] | Trade names [Member] | Hot Springs, Bryan and Broken Arrow [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 1.0
Finite-lived intangible asset useful life				20 years
Inpatient Rehabilitation Segment [Member] | Certificates of need [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life		$ 12.5
Finite-lived intangible asset useful life		20 years
Inpatient Rehabilitation Segment [Member] | Certificates of need [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Minimum [Member] | Noncompete agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		1 year
Minimum [Member] | Trade names [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		1 year
Minimum [Member] | Certificates of need [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		10 years
Minimum [Member] | Licenses [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		10 years
Minimum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		2 years
Minimum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			2 years
Minimum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Hot Springs, Bryan and Broken Arrow [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				1 year
Maximum [Member] | Noncompete agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		18 years
Maximum [Member] | Trade names [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		20 years
Maximum [Member] | Certificates of need [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		30 years
Maximum [Member] | Licenses [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		20 years
Maximum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Murrells Inlet, Winston-Salem and Littleton [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life		3 years
Maximum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			3 years
Maximum [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Hot Springs, Bryan and Broken Arrow [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life				3 years
Corporate Joint Venture [Member] | 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
Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Noncompete agreements [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			0.6
Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Trade names [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			0.5
Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Certificates of need [Member] | Gulfport, Mount Carmel, Jackson and Heritage Valley [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 9.8

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