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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 01, 2018 | Jul. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  | $ 276.5 |  |  |
Goodwill |  |  | 2,305.2 | $ 2,100.8 | $ 1,972.6 | $ 1,927.2
Current operating lease liabilities |  |  | 40.4 |  |  |
Home Health and Hospice Segment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | 1,086.3 | 911.6 | 806.6 | 785.2
Home Health and Hospice Segment | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Accounts receivable |  | $ 10.2 |  |  |  |
Prepaid expenses and other current assets |  | 1.7 |  |  |  |
Property and equipment |  | 0.7 |  |  |  |
Goodwill |  | 163.9 |  |  |  |
Other long-term assets |  | 5.0 |  |  |  |
Total assets acquired |  | 232.5 |  |  |  |
Current portion of long-term debt |  | 0.3 |  |  |  |
Accounts payable |  | 1.2 |  |  |  |
Accrued payroll |  | 8.1 |  |  |  |
Other current liabilities |  | 2.0 |  |  |  |
Long-term operating lease liabilities |  | 3.1 |  |  |  |
Total liabilities assumed |  | (14.7) |  |  |  |
Net assets acquired |  | 217.8 |  |  |  |
Home Health and Hospice Segment | Tidewater and Care Resource Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  | 0.2 |  |  |
Goodwill |  |  | 10.8 |  |  |
Total assets acquired |  |  | 14.0 |  |  |
Current operating lease liabilities |  |  | 0.1 |  |  |
Accrued payroll |  |  | 0.1 |  |  |
Long-term operating lease liabilities |  |  | 0.1 |  |  |
Total liabilities assumed |  |  | (0.3) |  |  |
Net assets acquired |  |  | 13.7 |  |  |
Home Health and Hospice Segment | Camellia Healthcare |  |  |  |  |  |
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 |  |  |  |  |
Other long-term assets | 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 | Celtic, Community, Bio Care, VNA, Ware, and Pickens County |  |  |  |  |  |
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 | Series of individually immaterial business acquisitions |  |  |  |  |  |
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 | Noncompete agreements | Golden Age, MSA and Tenet |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 5 years |  |
Home Health and Hospice Segment | Noncompete agreements | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 1.0 |  |  |  |
Finite-lived intangible asset useful life |  | 5 years |  |  |  |
Home Health and Hospice Segment | Noncompete agreements | Tidewater and Care Resource Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 0.2 |  |  |
Finite-lived intangible asset useful life |  |  | 5 years |  |  |
Home Health and Hospice Segment | Noncompete agreements | Camellia Healthcare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 0.5 |  |  |  |  |
Finite-lived intangible asset useful life | 5 years |  |  |  |  |
Home Health and Hospice Segment | Noncompete agreements | Celtic, Community, Bio Care, VNA, Ware, and Pickens County |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 0.2 |  |
Home Health and Hospice Segment | Noncompete agreements | Series of individually immaterial business acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 0.8 |
Finite-lived intangible asset useful life |  |  |  |  | 5 years |
Home Health and Hospice Segment | Trade names | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 1.0 |  |  |  |
Finite-lived intangible asset useful life |  | 6 months |  |  |  |
Home Health and Hospice Segment | Trade names | Camellia Healthcare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 1.4 |  |  |  |  |
Finite-lived intangible asset useful life | 1 year |  |  |  |  |
Home Health and Hospice Segment | Trade names | Series of individually immaterial business acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 0.1 |
Finite-lived intangible asset useful life |  |  |  |  | 1 year |
Home Health and Hospice Segment | Certificates of need | Golden Age, MSA and Tenet |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 10 years |  |
Home Health and Hospice Segment | Certificates of need | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 34.3 |  |  |  |
Finite-lived intangible asset useful life |  | 10 years |  |  |  |
Home Health and Hospice Segment | Certificates of need | Tidewater and Care Resource Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 2.0 |  |  |
Finite-lived intangible asset useful life |  |  | 10 years |  |  |
Home Health and Hospice Segment | Certificates of need | Camellia Healthcare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 16.6 |  |  |  |  |
Finite-lived intangible asset useful life | 10 years |  |  |  |  |
Home Health and Hospice Segment | Certificates of need | Celtic, Community, Bio Care, VNA, Ware, and Pickens County |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 2.5 |  |
Home Health and Hospice Segment | Certificates of need | Series of individually immaterial business acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 1.8 |
Finite-lived intangible asset useful life |  |  |  |  | 10 years |
Home Health and Hospice Segment | Licenses | Golden Age, MSA and Tenet |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 10 years |  |
Home Health and Hospice Segment | Licenses | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 14.6 |  |  |  |
Finite-lived intangible asset useful life |  | 10 years |  |  |  |
Home Health and Hospice Segment | Licenses | Tidewater and Care Resource Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 0.8 |  |  |
Finite-lived intangible asset useful life |  |  | 10 years |  |  |
Home Health and Hospice Segment | Licenses | Camellia Healthcare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 21.6 |  |  |  |  |
Finite-lived intangible asset useful life | 10 years |  |  |  |  |
Home Health and Hospice Segment | Licenses | Celtic, Community, Bio Care, VNA, Ware, and Pickens County |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 1.5 |  |
Home Health and Hospice Segment | Licenses | Series of individually immaterial business acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 4.0 |
Finite-lived intangible asset useful life |  |  |  |  | 10 years |
Home Health and Hospice Segment | Software Development | Alacare |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 0.1 |  |  |  |
Finite-lived intangible asset useful life |  | 3 years |  |  |  |
Inpatient Rehabilitation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 1,218.9 | $ 1,189.2 | $ 1,166.0 | $ 1,142.0
Inpatient Rehabilitation | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property and equipment |  |  |  |  | 0.1 |
Identifiable intangible assets |  |  |  |  | 9.8 |
Goodwill |  |  |  |  | 24.0 |
Total assets acquired |  |  |  |  | 35.0 |
Inpatient Rehabilitation | Saint Alphonsus and Heritage Valley |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | 4.8 |  |  |
Total assets acquired |  |  | 5.3 |  |  |
Total liabilities assumed |  |  | (0.2) |  |  |
Net assets acquired |  |  | 5.1 |  |  |
Inpatient Rehabilitation | Noncompete agreements | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | 0.6 |
Inpatient Rehabilitation | Noncompete agreements | Saint Alphonsus and Heritage Valley |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 0.1 |  |  |
Finite-lived intangible asset useful life |  |  | 2 years |  |  |
Inpatient Rehabilitation | Trade names | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 20 years |  |
Inpatient Rehabilitation | Trade names | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 0.5 |
Finite-lived intangible asset useful life |  |  |  |  | 20 years |
Inpatient Rehabilitation | Trade names | Saint Alphonsus and Heritage Valley |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 0.4 |  |  |
Finite-lived intangible asset useful life |  |  | 20 years |  |  |
Inpatient Rehabilitation | Certificates of need | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 20 years |  |
Inpatient Rehabilitation | Certificates of need | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 20 years |
Minimum | Noncompete agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 1 year |  |  |
Minimum | Trade names |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 1 year |  |  |
Minimum | Certificates of need |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 10 years |  |  |
Minimum | Licenses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 10 years |  |  |
Minimum | Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 2 years |  |
Minimum | Inpatient Rehabilitation | Noncompete agreements | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 2 years |
Maximum | Noncompete agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 18 years |  |  |
Maximum | Trade names |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 20 years |  |  |
Maximum | Certificates of need |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 30 years |  |  |
Maximum | Licenses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 20 years |  |  |
Maximum | Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 3 years |  |
Maximum | Inpatient Rehabilitation | Noncompete agreements | Hot Springs, Bryan and Broken Arrow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 3 years |
Corporate Joint Venture | Inpatient Rehabilitation | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
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 |  |
Corporate Joint Venture | Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 1.4 |  |
Corporate Joint Venture | Inpatient Rehabilitation | Trade names | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 2.3 |  |
Corporate Joint Venture | Inpatient Rehabilitation | Certificates of need | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 12.5 |  |

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