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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
2021 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue | $ 5,152.2 | $ 4,705.2 |
Business acquisition, pro forma net income (loss) | 413.0 | 286.8 |
2020 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue |  | 4,650.3 | $ 4,626.0
Business acquisition, pro forma net income (loss) |  | 284.8 | 360.8
2019 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue |  |  | 4,674.6
Business acquisition, pro forma net income (loss) |  |  | 364.3
Inpatient Rehabilitation Segment |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | 0.0 |  |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual | 0.0 |  |
Inpatient Rehabilitation Segment | Portercare Adventist and Premier Health Partners |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  | 0.0 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  | 0.0 |
Inpatient Rehabilitation Segment | Saint Alphonsus and Heritage Valley |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 4.4
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | (1.3)
Home Health and Hospice |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | 20.6 |  |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual | $ 0.6 |  |
Home Health and Hospice | Alacare |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 58.5
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | 1.6
Home Health and Hospice | Tidewater and Care Resource Group |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 6.5
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | $ (1.5)
Home Health and Hospice | Generation Solutions of Lynchburg |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  | 1.5 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  | $ 0.0 |

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