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Acquisitions - Summary (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Net assets acquired:    
Goodwill $ 3,613.6 $ 3,468.0
Surgical Facilities, Existing Markets    
Business Acquisition [Line Items]    
Total consideration 103.0  
Fair value of non-controlling interests 46.4  
Aggregate acquisition date fair value 149.4  
Net assets acquired:    
Current assets 6.9  
Property and equipment 3.8  
Goodwill 145.8  
Right-of-use operating lease assets 8.2  
Other long-term assets 0.1  
Current liabilities (8.2)  
Long-term debt (0.1)  
Right-of-use operating lease liabilities (7.1)  
Aggregate acquisition date fair value $ 149.4