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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 |  |  |  |  |

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