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Acquisitions and Disposals - Acquisitions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) surgical_facility physician_practice | Dec. 31, 2019 USD ($) surgical_facility physician_practice | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Total cash consideration, net of cash acquired | $ 104.6 | $ 13.8 | $ 106.8
Number of surgical facilities acquired | surgical_facility |  | 4 |
Cash investment for purchase of equity investment | 0.0 | $ 15.2 | $ 0.0
Surgical Facility and Physician Practice |  |  |
Business Acquisition [Line Items] |  |  |
Total aggregate consideration | 120.1 | 27.4 |
Total cash consideration, net of cash acquired | 104.6 | 20.1 |
Noncash consideration | 8.7 |  |
Contingent consideration | 0.7 |  |
Additional cash consideration from working capital settlement payment | $ 0.8 |  |
Surgical Facility and Physician Practice | Previously Reported |  |  |
Business Acquisition [Line Items] |  |  |
Total aggregate consideration |  | $ 26.7 |
Surgical Facilities, Including Surgical Hospital |  |  |
Business Acquisition [Line Items] |  |  |
Number of business entities acquired | surgical_facility | 3 |  |
Surgical Facilities, Existing Markets |  |  |
Business Acquisition [Line Items] |  |  |
Number of business entities acquired | surgical_facility | 5 | 1 |
Physician Practice |  |  |
Business Acquisition [Line Items] |  |  |
Number of business entities acquired | physician_practice | 1 | 1 |

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