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Goodwill and Intangible Assets - Additional Information (Details)
 9 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
reporting_unit
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
reporting_unit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Number of reporting units | reporting_unit 3   3    
Goodwill impairment loss     $ 5,400,000    
Goodwill     3,468,000,000.0 $ 3,402,400,000 $ 3,382,800,000
Amortization expense     $ 4,300,000 4,600,000 4,900,000
Physician income guarantees | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     3 years    
Physician income guarantees | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     4 years    
Non-compete agreements | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     2 years    
Non-compete agreements | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     5 years    
Management rights agreements          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     15 years    
Customer relationships | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     3 years    
Customer relationships | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Useful lives of intangible assets     10 years    
Surgical Facility Services          
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 3,300,000,000        
Ancillary Services          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment loss   $ 28,600,000     60,700,000
Goodwill 0        
Alliance          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment loss   $ 4,900,000   $ 2,500,000 $ 13,700,000
Goodwill $ 4,200,000