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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pro forma revenue | $ 4,650.3 | $ 4,626.0 | $ 4,337.4 | $ 4,039.9
Business acquisition, pro forma net income (loss) | 284.8 | 360.8 | 300.0 | $ 289.0
2019 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pro forma revenue |  | 4,674.6 |  |
Business acquisition, pro forma net income (loss) |  | 364.3 |  |
2018 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pro forma revenue |  |  | 4,415.9 |
Business acquisition, pro forma net income (loss) |  |  | 301.8 |
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) |  |
Inpatient Rehabilitation Segment | Tidelands Health, Novant Health, Portercare Adventist Health |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 9.1 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | (1.6) |
Home Health and Hospice | Portercare Adventist and Premier Health Partners |  |  |  |
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 |  |  |
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 | Camellia Healthcare |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 50.0 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | (0.9) |
Home Health and Hospice | Golden Age Hospice, Medical Services Of America, Tenet Hospital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | 3.5 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  | $ (0.3) |

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