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Business Combinations - Textual (Details) |  | 1 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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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