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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 | May 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Nov. 30, 2018 | May 01, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | $ 245.7 | $ 276.5 |  |  |  |  |  |  |  |
Goodwill |  |  | 2,318.7 | 2,305.2 | $ 2,100.8 |  |  |  |  |  |  | $ 1,972.6
Current operating lease liabilities |  |  | 44.8 | 40.4 |  |  |  |  |  |  |  |
Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,228.1 | $ 1,218.9 | $ 1,189.2 |  |  |  |  |  |  | 1,166.0
Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  | $ 0.1 |  |  |  |  |  |
Goodwill |  |  |  |  |  | 9.2 |  |  |  |  |  |
Total assets acquired |  |  |  |  |  | 10.9 |  |  |  |  |  |
Inpatient Rehabilitation | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  | $ 0.1 |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | 12.5 |  |
Goodwill |  |  |  |  |  |  |  |  |  | 23.2 |  |
Total assets acquired |  |  |  |  |  |  |  |  |  | 39.5 |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  | 0.2 |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | 39.3 |  |
Inpatient Rehabilitation | Noncompete agreements | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | 0.7 |  |  |  |  |  |
Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | 1.4 |  |
Inpatient Rehabilitation | Trade names | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | $ 0.9 |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 20 years |  |  |  |  |  |  |  |  |
Inpatient Rehabilitation | Trade names | Saint Alphonsus and Heritage Valley |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 20 years |  |  |  |  |  |  |  |
Inpatient Rehabilitation | Trade names | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 2.3 |  |
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 |  |  |  |  |  |  |
Home Health and Hospice |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,090.6 | $ 1,086.3 | $ 911.6 |  |  |  |  |  |  | $ 806.6
Home Health and Hospice | Generation Solutions of Lynchburg |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1.0 |  |  |  |  |
Total assets acquired |  |  |  |  |  |  | 1.1 |  |  |  |  |
Home Health and Hospice | 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 lease liabilities | 3.1 |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed | 14.7 |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 217.8 |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice | 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 lease liabilities |  |  |  |  |  |  |  |  | 0.1 |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  | 0.3 |  |  |
Net assets acquired |  |  |  |  |  |  |  |  | 13.7 |  |  |
Home Health and Hospice | 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 |
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 | Golden Age, MSA and Tenet |  |  |  |  |  |  |  |  |  |  |  |
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 | Noncompete agreements | Alacare |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 1.0 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life | 5 years |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice | 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 | 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 | Noncompete agreements | Golden Age, MSA and Tenet |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 0.2 |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 5 years |  |  |  |  |  |  |
Home Health and Hospice | Trade names | Alacare |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 1.0 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life | 6 months |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice | 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 | 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 | 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 | 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 | Certificates of need | Golden Age, MSA and Tenet |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 2.5 |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 10 years |  |  |  |  |  |  |
Home Health and Hospice | Licenses | Generation Solutions of Lynchburg |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  | $ 0.1 |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 10 years |  |  |  |  |  |  |  |  |
Home Health and Hospice | Licenses | Alacare |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 14.6 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life | 10 years |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice | 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 | Licenses | Camellia Healthcare |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  | $ 21.6 |
Finite-lived intangible asset useful life |  | 10 years |  |  |  |  |  |  |  |  |  |
Home Health and Hospice | Licenses | Golden Age, MSA and Tenet |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 1.5 |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 10 years |  |  |  |  |  |  |
Home Health and Hospice | Software Development | Alacare |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 0.1 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life | 3 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 | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 2 years |  |  |  |  |  |  |  |  |
Minimum | Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |  |  |
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 | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 3 years |  |  |  |  |  |  |  |  |
Maximum | Inpatient Rehabilitation | Noncompete agreements | Saint Alphonsus and Heritage Valley |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 2 years |  |  |  |  |  |  |  |
Maximum | Inpatient Rehabilitation | Noncompete agreements | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  |  | 3 years |  |  |  |  |  |  |
Corporate Joint Venture | 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 |  |  |  |
Corporate Joint Venture | Inpatient Rehabilitation | Noncompete agreements | Saint Alphonsus and Heritage Valley |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | 0.1 |  |  |  |
Corporate Joint Venture | Inpatient Rehabilitation | Trade names | Saint Alphonsus and Heritage Valley |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | $ 0.4 |  |  |  |

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