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Business Combinations - Textual (Details)		1 Months Ended
	Sep. 01, 2017	Jul. 31, 2019 USD ($) location bed	Dec. 31, 2019 USD ($)	Sep. 30, 2019 bed	Mar. 31, 2019 location	Dec. 31, 2018 USD ($)	Nov. 01, 2018 location bed	Oct. 08, 2018 bed	Sep. 05, 2018 bed	Jun. 01, 2018 location	May 01, 2018 USD ($)	Jan. 01, 2018 location	Dec. 31, 2017 USD ($)	Aug. 01, 2017 location	Jul. 01, 2017 location	May 01, 2017 location	Apr. 08, 2017 bed	Apr. 01, 2017 bed	Feb. 01, 2017 location	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 2,305,200,000			$ 2,100,800,000							$ 1,972,600,000							$ 1,927,200,000
Inpatient Rehabilitation
Business Acquisition [Line Items]
Goodwill			1,218,900,000			1,189,200,000							1,166,000,000.0							1,142,000,000.0
Inpatient Rehabilitation | Saint Alphonsus and Heritage Valley
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible			0
Goodwill			4,800,000
Inpatient Rehabilitation | Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible						0
Inpatient Rehabilitation | Gulfport, Mount Carmel, Jackson and Heritage Valley
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible													0
Home Health and Hospice Segment
Business Acquisition [Line Items]
Goodwill			1,086,300,000			911,600,000							$ 806,600,000							$ 785,200,000
Home Health and Hospice Segment | Tidewater and Care Resource Group
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible			10,800,000
Goodwill			10,800,000
Home Health and Hospice Segment | Alacare
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible		$ 163,900,000
Payments to acquire businesses, gross		217,800,000
Goodwill		$ 163,900,000
Home Health and Hospice Segment | Camellia Healthcare
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible			96,100,000
Goodwill											$ 96,100,000
Home Health and Hospice Segment | Celtic, Community, Bio Care, VNA, Ware, and Pickens County
Business Acquisition [Line Items]
Goodwill expected to be tax-deductible			$ 8,900,000
Goodwill						8,900,000
Home health | Home Health and Hospice Segment | Community Health Services, Inc.
Business Acquisition [Line Items]
Number of locations | location																			2
Home health | Home Health and Hospice Segment | Bio Care Home Health Services and Kinsman Enterprises
Business Acquisition [Line Items]
Number of locations | location																2
Home health | Home Health and Hospice Segment | VNA Healthtrends - IL, IN, AZ
Business Acquisition [Line Items]
Number of locations | location															4
Home health | Home Health and Hospice Segment | VNA Healthtrends - OH and IL
Business Acquisition [Line Items]
Number of locations | location														2
Home health | Home Health and Hospice Segment | Care Resource Group
Business Acquisition [Line Items]
Number of locations | location					2
Home health | Home Health and Hospice Segment | Alacare
Business Acquisition [Line Items]
Number of locations | location		23
Hospice | Home Health and Hospice Segment | Golden Age Hospice, Inc.
Business Acquisition [Line Items]
Number of locations | location												1
Hospice | Home Health and Hospice Segment | Medical Services of America
Business Acquisition [Line Items]
Number of locations | location										1
Hospice | Home Health and Hospice Segment | Alacare
Business Acquisition [Line Items]
Number of locations | location		23
Corporate Joint Venture | Inpatient Rehabilitation | Saint Alphonsus
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent		51.00%
Number of beds acquired | bed		30
Number of beds contributed | bed		40
Corporate Joint Venture | Inpatient Rehabilitation | Murrells Inlet
Business Acquisition [Line Items]
Number of beds acquired | bed									29
Interest acquired in business acquisition (percent)									62.00%
Number of certificate of need beds acquired | bed									60
Number of de novo beds | bed									46
Corporate Joint Venture | Inpatient Rehabilitation | Winston-Salem (Novant)
Business Acquisition [Line Items]
Number of beds acquired | bed								68
Number of beds contributed | bed								68
Interest acquired in business acquisition (percent)								50.00%
Corporate Joint Venture | Inpatient Rehabilitation | Littleton
Business Acquisition [Line Items]
Number of beds acquired | bed							17
Interest acquired in business acquisition (percent)							68.00%
Corporate Joint Venture | Inpatient Rehabilitation | Murrells Inlet, Winston-Salem and Littleton
Business Acquisition [Line Items]
Goodwill						$ 23,200,000
Corporate Joint Venture | Inpatient Rehabilitation | Memorial Hospital at Gulfport
Business Acquisition [Line Items]
Number of beds acquired | bed																		33
Interest acquired in business acquisition (percent)																		80.00%
Corporate Joint Venture | Inpatient Rehabilitation | Mount Carmel West
Business Acquisition [Line Items]
Number of beds contributed | bed																	60
Interest acquired in business acquisition (percent)																	80.00%
Corporate Joint Venture | Inpatient Rehabilitation | Jackson-Madison County General Hospital
Business Acquisition [Line Items]
Interest acquired in business acquisition (percent)															50.00%
Corporate Joint Venture | Inpatient Rehabilitation | Heritage Valley Beaver Hospital
Business Acquisition [Line Items]
Interest acquired in business acquisition (percent)	75.00%
Interest exchanged in business acquisition (percent)	25.00%
Corporate Joint Venture | Inpatient Rehabilitation | Heritage Valley
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent				75.00%
Number of beds acquired | bed				11
Corporate Joint Venture | Home Health and Hospice Segment | Tenet
Business Acquisition [Line Items]
Interest acquired in business acquisition (percent)						75.00%
Corporate Joint Venture | Home health | Home Health and Hospice Segment | Tenet
Business Acquisition [Line Items]
Interest acquired in business acquisition (percent)							75.00%
Number of locations | location							1

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