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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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