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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, pro forma revenue |  |  | $ 4,674.6 | $ 4,415.9 |  |
Business acquisition, pro forma net income (loss) |  |  | 364.3 | 301.8 |  |
2017 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, pro forma revenue |  |  |  |  | $ 4,039.9 |
Business acquisition, pro forma net income (loss) |  |  |  |  | 289.0 |
2018 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, pro forma revenue |  |  |  | 4,337.4 |  |
Business acquisition, pro forma net income (loss) |  |  |  | 300.0 |  |
2016 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, pro forma information, revenue of acquiree since acquisition date, actual |  |  |  |  | 32.9 |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  |  | (6.3) |
Business acquisition, pro forma revenue |  |  |  |  | 3,996.1 | $ 3,771.5
Business acquisition, pro forma net income (loss) |  |  |  |  | $ 260.3 | $ 254.8
Inpatient Rehabilitation Segment | 2018 Acquisitions |  |  |  |  |  |
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) |  |  |  |  |
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 Segment | 2018 Acquisitions |  |  |  |  |  |
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) |  |
Home Health and Hospice Segment | 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 Segment | 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 Segment | 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) |  |  |  |

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