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Acquisitions, Disposals and Deconsolidations - Disposals and Deconsolidations (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) surgical_facility | Dec. 31, 2023 USD ($) surgical_facility | Dec. 31, 2022 USD ($) business_entity surgical_facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sales of equity investments | $ 4.6 | $ 1.4 | $ 12.8
Loss on sale of equity method investment | 10.0 |  |
Proceeds from disposals of facilities and other assets | $ 2.6 | $ 25.8 | 12.9
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gain (Loss) On Disposition Of Assets And Deconsolidation |
Surgical Facility, Equity Method Investment | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of interests sold | surgical_facility | 3 |  |
Proceeds from sales of equity investments | $ 2.6 |  |
Loss on sale of equity method investment | $ 9.5 |  |
Surgical Facility With A Retained Interest | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of interests sold | surgical_facility | 1 |  |
Proceeds from disposals of facilities and other assets | $ 2.5 |  |
Pre-tax gain (loss) on disposal | $ 2.7 |  |
Surgical Facility | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of interests sold | surgical_facility | 9 |  |
Proceeds from disposals of facilities and other assets | $ 5.4 |  |
Pre-tax gain (loss) on disposal | $ (14.6) |  |
2023 Disposals | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of interests sold | surgical_facility |  | 6 |
Proceeds from disposals of facilities and other assets |  | $ 30.4 |
Pre-tax gain (loss) on disposal |  | 26.9 |
Surgical Facilities and In-Development De Novo Surgical Facilities | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sales of equity investments |  | 1.5 |
Loss on sale of equity method investment |  | $ 13.7 |
2022 Disposals |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Pre-tax gain (loss) on disposal |  |  | $ (5.6)
2022 Disposals | Disposed of by Sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of interests sold | surgical_facility |  |  | 2
Proceeds from disposals of facilities and other assets |  |  | $ 25.7
Pre-tax gain (loss) on disposal |  |  | $ (4.5)
Disposal group, number of surgical facilities contributed as non-cash consideration | surgical_facility |  |  | 2
Investment owned, fair value |  |  | $ 9.8
2022 Disposals | Disposed of by Sale | Series of Individually Immaterial Business Acquisitions |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of business entities acquired | business_entity |  |  | 2

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