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Business Combinations - Net Cash Paid for Acquisition (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jul. 31, 2019 | May 31, 2018 | Mar. 31, 2019 | Sep. 30, 2019 | Nov. 30, 2018 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 10.2 | $ 179.5 | $ 128.2
Net cash paid for acquisitions |  |  |  |  |  |  |  | 1.1 | 231.5 | 143.9
Inpatient Rehabilitation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 9.2 | 4.8 | 23.2
Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  | $ 1.7 |  |  |
Goodwill |  |  |  |  |  |  | 9.2 |  |  |
Fair value of noncontrolling interest owned by joint venture partner |  |  |  |  |  |  | (10.9) |  |  |
Net cash paid for acquisitions |  |  |  |  |  |  | $ 0.0 |  |  |
Inpatient Rehabilitation | Saint Alphonsus and Heritage Valley |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  | $ 0.5 |  |  |  |  |
Goodwill |  |  |  |  | 4.8 |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  | (0.2) |  |  |  |  |
Fair value of noncontrolling interest owned by joint venture partner |  |  |  |  | (5.1) |  |  |  |  |
Net cash paid for acquisitions |  |  |  |  | $ 0.0 |  |  |  |  |
Inpatient Rehabilitation | Murrells Inlet, Winston-Salem and Littleton |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  | $ 16.3 |  |  |  |
Goodwill |  |  |  |  |  | 23.2 |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  | (0.2) |  |  |  |
Fair value of noncontrolling interest owned by joint venture partner |  |  |  |  |  | (39.3) |  |  |  |
Net cash paid for acquisitions |  |  |  |  |  | $ 0.0 |  |  |  |
Home Health and Hospice |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 1.0 | $ 174.7 | 105.0
Home Health and Hospice | Generation Solutions of Lynchburg |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired | $ 0.1 |  |  |  |  |  |  |  |  |
Goodwill | 1.0 |  |  |  |  |  |  |  |  |
Net cash paid for acquisitions | $ 1.1 |  |  |  |  |  |  |  |  |
Home Health and Hospice | Alacare |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  | $ 68.6 |  |  |  |  |  |  |  |
Goodwill |  | 163.9 |  |  |  |  |  |  |  |
Fair value of liabilities assumed |  | (14.7) |  |  |  |  |  |  |  |
Net cash paid for acquisitions |  | $ 217.8 |  |  |  |  |  |  |  |
Home Health and Hospice | Tidewater and Care Resource Group |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  | $ 3.2 |  |  |  |  |  |
Goodwill |  |  |  | 10.8 |  |  |  |  |  |
Fair value of liabilities assumed |  |  |  | (0.3) |  |  |  |  |  |
Net cash paid for acquisitions |  |  |  | $ 13.7 |  |  |  |  |  |
Home Health and Hospice | Camellia Healthcare |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  | $ 41.0 |  |  |  |  |  |  |
Goodwill |  |  | 96.1 |  |  |  |  |  |  |
Fair value of liabilities assumed |  |  | (5.7) |  |  |  |  |  |  |
Net cash paid for acquisitions |  |  | $ 131.4 |  |  |  |  |  |  |
Home Health and Hospice | Golden Age, MSA and Tenet |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  | 4.3
Goodwill |  |  |  |  |  |  |  |  |  | 8.9
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  | (0.1)
Fair value of noncontrolling interest owned by joint venture partner |  |  |  |  |  |  |  |  |  | (0.6)
Net cash paid for acquisitions |  |  |  |  |  |  |  |  |  | $ 12.5

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