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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, pro forma revenue | $ 1,076.0 | $ 1,140.3 |  | $ 2,262.0 | $ 2,269.5
Business acquisition, pro forma net income | $ 33.7 | $ 91.7 |  | 121.1 | $ 194.5
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 |  |  | $ 0.6 |  |
Business combination, pro forma information, earnings of acquiree since acquisition date, actual |  |  | $ 0.0 |  |

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