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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 2,318.7 | $ 2,305.2
Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners |  |  |
Business Acquisition [Line Items] |  |  |
Property and equipment, net |  | 0.1 |
Goodwill |  | 9.2 |
Total assets acquired |  | 10.9 |
Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners | Noncompete Agreements |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | 0.7 |
Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners | Trade Name |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets |  | $ 0.9 |
Finite-lived intangible asset useful life |  | 20 years |
Inpatient Rehabilitation | Maximum | Portercare Adventist and Premier Health Partners | Noncompete Agreements |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset useful life |  | 3 years |
Inpatient Rehabilitation | Minimum | Portercare Adventist and Premier Health Partners | Noncompete Agreements |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible asset useful life |  | 2 years |
Home Health and Hospice | Generation Solutions of Lynchburg |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1.0 |  |
Total assets acquired | 1.1 |  |
Home Health and Hospice | Generation Solutions of Lynchburg | Licensing Agreements |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 0.1 |  |
Finite-lived intangible asset useful life | 10 years |  |

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