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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue | $ 4,369.0 | $ 4,039.8 |
Business acquisition, pro forma net income (loss) | 273.7 | 415.3 |
Altru Health System, Trinity Medical Center And NCH Healthcare System |  |  |
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 |  |
Shannon Medical, Heritage Valley & ECHD Ventures |  |  |
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 |
2021 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue |  | 4,021.1 | $ 3,581.3
Business acquisition, pro forma net income (loss) |  | $ 412.5 | 285.0
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
2020 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, pro forma revenue |  |  | 3,571.9
Business acquisition, pro forma net income (loss) |  |  | $ 284.8

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