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Acquisitions - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
surgical_facility
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]    
Payments for acquisitions, net of cash acquired | $ $ 101.0 $ 14.2
Surgical Facilities, New Markets    
Business Acquisition [Line Items]    
Number of facilities acquired | surgical_facility 4  
Surgical Facilities, Existing Markets    
Business Acquisition [Line Items]    
Number of facilities acquired | surgical_facility 2  
Payments for acquisitions, net of cash acquired | $ $ 101.0