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Acquisitions and Disposals - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net assets acquired:      
Goodwill $ 3,468.0 $ 3,402.4 $ 3,382.8
Surgical Facility and Physician Practice      
Business Acquisition [Line Items]      
Consideration transferred 120.1 27.4  
Fair value of non-controlling interests 57.3 8.3  
Aggregate acquisition date fair value 177.4 35.7  
Net assets acquired:      
Current Assets 24.3 5.4  
Property and equipment 50.6 1.8  
Intangible assets 3.6 0.0  
Goodwill 153.7 23.4  
Right-of-use operating lease assets 15.4 28.8  
Other long-term assets 0.2 8.9  
Current liabilities (16.4) (4.2)  
Long-term debt (40.0) (0.2)  
Right-of-use operating lease liabilities (14.0) (28.2)  
Aggregate acquisition date fair value $ 177.4 35.7  
Surgical Facility      
Business Acquisition [Line Items]      
Fair value of non-controlling interests   8.8  
Net assets acquired:      
Proceeds from noncontrolling interests   $ 6.3