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Acquisitions and Disposals - Disposals and Deconsolidations (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) facility business_entity | Dec. 31, 2021 USD ($) | Dec. 31, 2021 physician_practice | Dec. 31, 2021 surgery_center | Dec. 31, 2020 USD ($) surgery_center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from disposals of facilities and other assets | $ 12.9 | $ 6.0 |  |  | $ 58.5
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 |  |  |  |
Disposal Group One | Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of interests sold | 2 |  | 1 | 3 | 3
Proceeds from disposals of facilities and other assets | $ 25.7 | 6.0 |  |  | $ 58.5
Pre-tax gain (loss) on disposal | $ (4.5) | $ 4.0 |  |  | 5.2
Disposal Group One | Disposed of by Sale | Equity Method Investments |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of interests sold | facility | 1 |  |  |  |
Disposal Group Two |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pre-tax gain (loss) on disposal | $ (5.6) |  |  |  |
Disposal Group Two | Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pre-tax gain (loss) on disposal |  |  |  |  | $ (3.5)
Number of surgical facilities contributed as non-cash consideration | facility | 2 |  |  |  |
Fair value of investments | $ 9.8 |  |  |  |
Disposal Group Two | 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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