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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, pro forma revenue | $ 1,173.9 | $ 1,166.9 |  | $ 3,435.9 | $ 3,436.3
Business acquisition, pro forma net income | $ 77.7 | $ 98.1 |  | 198.8 | $ 292.6
Portercare Adventist and Premier Health Partners | Inpatient Rehabilitation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  |  | 0.0 |
Business combination, pro forma information, earnings of acquiree since acquisition date, actual |  |  |  | $ 0.0 |
Generation Solutions of Lynchburg | Home Health and Hospice |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  | $ 1.1 |  |
Business combination, pro forma information, earnings of acquiree since acquisition date, actual |  |  | $ 0.0 |  |

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