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Acquisitions and Disposals - Disposals (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
surgery_center
Sep. 30, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposals of facilities and other assets   $ 48.3 $ 17.6
Surgery Centers      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of surgery centers sold | surgery_center   2  
Proceeds from disposals of facilities and other assets   $ 9.4  
Pre-tax gain (loss)   (3.1)  
Certain Assets Related to Anesthesia Business      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposals of facilities and other assets   38.9  
Pre-tax gain (loss) $ 5.1 5.1  
Diagnostic Laboratory      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax gain (loss) $ (3.5) $ (3.5)