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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Oct. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 1,972.6	$ 1,927.2	$ 1,890.1			$ 1,084.0
Noncompete agreements [Member] \| CareSouth [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			3 years
Trade names [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			1 year
Trade names [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Trade names [Member] \| CareSouth [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			5 years
Certificates of need [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Certificates of need [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Certificates of need [Member] \| CareSouth [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Licenses [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Licenses [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			20 years
Licenses [Member] \| CareSouth [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			10 years
Home Health and Hospice Segment [Member]
Business Acquisition [Line Items]
Goodwill	806.6	$ 785.2	$ 757.0			592.5
Home Health and Hospice Segment [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Property and equipment			0.1
Goodwill	41.4	41.4	20.3
Total assets acquired		48.5	30.7
Total liabilities assumed	(0.4)	(0.4)	(0.2)
Net assets acquired		48.1	30.5
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] \| CareSouth [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				$ 0.4
Accounts receivable				10.5
Prepaid expenses and other current assets				2.0
Property and equipment				0.7
Goodwill				143.3
Investment in noconsolidated affiliates, acquired				2.2
Total assets acquired				191.7
Current portion of long-term debt				0.1
Accounts payable				2.7
Accrued payroll				2.4
Other current liabilities				2.8
Long-term debt				0.2
Deferred tax liabilities				9.5
Total liabilities assumed				17.7
Noncontrolling interests				4.3
Net assets acquired				169.7
Home Health and Hospice Segment [Member] \| Software Development [Member] \| CareSouth [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				0.4
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	1.3
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] \| CareSouth [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				0.8
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	0.5
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] \| CareSouth [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				2.8
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	4.9
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] \| CareSouth [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				15.6
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	3.6
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] \| CareSouth [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life				$ 13.0
Inpatient Rehabilitation Segment [Member]
Business Acquisition [Line Items]
Goodwill	$ 1,166.0	$ 1,142.0	1,133.1			$ 491.5
Inpatient Rehabilitation Segment [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Total current assets			10.1
Property and equipment			42.7
Goodwill			0.7
Total assets acquired			63.4
Total liabilities assumed			(2.7)
Noncontrolling interests			(4.2)
Net assets acquired			60.7
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
Total liabilities assumed		16.1
Inpatient Rehabilitation Segment [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 42.6
Accounts receivable					25.7
Prepaid expenses and other current assets					2.8
Property and equipment					220.6
Goodwill					642.6
Other long-term assets					0.9
Total assets acquired					1,001.8
Current portion of long-term debt					4.1
Accounts payable					1.7
Accrued payroll					3.7
Other current liabilities					10.8
Long-term debt					205.8
Deferred tax liabilities					3.9
Total liabilities assumed					230.0
Noncontrolling interests					0.4
Net assets acquired					771.4
Inpatient Rehabilitation Segment [Member] \| Noncompete agreements [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			0.1
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] \| Noncompete agreements [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life					9.7
Inpatient Rehabilitation Segment [Member] \| Trade names [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 0.8
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] \| 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] \| Reliant [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life					8.9
Inpatient Rehabilitation Segment [Member] \| Certificates of need [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 8.8
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
Inpatient Rehabilitation Segment [Member] \| Certificates of need [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life					36.6
Inpatient Rehabilitation Segment [Member] \| Licenses [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life			$ 0.2
Finite-lived intangible asset useful life			20 years
Inpatient Rehabilitation Segment [Member] \| Licenses [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Identifiable intangible assets, Finite life					$ 11.4
Minimum [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life	1 year
Minimum [Member] \| Noncompete agreements [Member] \| Reliant [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] \| Home Health and Hospice Segment [Member] \| Noncompete agreements [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			5 years
Minimum [Member] \| Inpatient Rehabilitation Segment [Member] \| Noncompete agreements [Member] \| Series of individually immaterial business acquisitions [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
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
Maximum [Member] \| Noncompete agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life	18 years
Maximum [Member] \| Noncompete agreements [Member] \| Reliant [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			2 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] \| Home Health and Hospice Segment [Member] \| Noncompete agreements [Member] \| Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset useful life			2 years
Maximum [Member] \| Inpatient Rehabilitation Segment [Member] \| Noncompete agreements [Member] \| Series of individually immaterial business acquisitions [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
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
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