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v3.20.4

Acquisitions and Disposals - Disposals (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) surgery_center | Dec. 31, 2019 USD ($) | Dec. 31, 2018 optical_laboratory | Dec. 31, 2018 USD ($) | Dec. 31, 2018 surgery_center | Dec. 31, 2018 surgical_hospital
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from disposals of facilities and other assets | $ 58.5 | $ 17.6 |  | $ 19.2 |  |
Surgery Centers, Certain Assets Related to Anesthesia Business, Certain Imaging ASsets and Optical Products Purchasing Organization |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of interests sold | surgery_center | 3 |  |  |  |  |
Proceeds from disposals of facilities and other assets | $ 58.5 |  |  |  |  |
Pre-tax gain (loss) | 5.2 |  |  |  |  |
Diagnostic Laboratory |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) | $ (3.5) |  |  |  |  |
Previously Owned Real Property Associated with Existing Non-Consolidated Surgical Facility |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) |  | $ 10.9 |  |  |  |
Surgery Centers, Surgical Hospitals, and Optical Laboratory |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of interests sold |  |  | 1 |  | 4 | 2
Proceeds from disposals of facilities and other assets |  |  |  | 18.7 |  |
Pre-tax gain (loss) |  |  |  | $ (21.2) |  |

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