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Segment Reporting - Revenues and Operating Income by Reportable Segment (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]            
Number of operating segments | segment       2    
Segment Reporting Information [Line Items]            
Revenues $ 543.3 $ 374.7   $ 1,055.7 $ 815.7  
Adjusted EBITDA 75.9 58.2   148.8 104.7  
Reconciliation of Adjusted EBITDA:            
Income (loss) before income taxes 6.1 (4.5)   17.1 (28.1)  
Net income attributable to non-controlling interests (35.7) (28.6)   (67.5) (47.7)  
Depreciation and amortization 25.2 23.4   50.9 45.2  
Interest expense, net 53.4 49.2   106.7 96.3  
Equity-based compensation expense 4.1 3.4   9.3 6.9  
Transaction, integration and acquisition costs 11.4 10.1   20.8 22.7  
Loss on disposals and deconsolidations, net 1.0 2.9   0.1 6.4  
Litigation settlement and other litigation costs 0.8 2.3   1.8 3.8  
Loss on debt extinguishment 9.6 0.0   9.6 0.0  
Gain on escrow release 0.0 0.0   0.0 (0.8)  
Adjusted EBITDA 75.9 58.2   148.8 104.7  
Transaction and integration costs 9.2 4.9   14.5 10.4  
Start-up costs 2.2 5.2   6.3 12.3  
Other litigation costs 0.8 2.3   1.8 2.6  
Litigation settlement 0.0 0.0 $ 1.2 0.0 1.2 $ 46.0
Operating Segments | Surgical Facility Services            
Segment Reporting Information [Line Items]            
Revenues 525.8 361.0   1,021.6 784.2  
Adjusted EBITDA 95.6 80.0   190.6 147.2  
Reconciliation of Adjusted EBITDA:            
Adjusted EBITDA 95.6 80.0   190.6 147.2  
Operating Segments | Ancillary Services            
Segment Reporting Information [Line Items]            
Revenues 17.5 13.2   34.1 30.2  
Adjusted EBITDA (0.1) (1.3)   (1.0) (3.3)  
Reconciliation of Adjusted EBITDA:            
Adjusted EBITDA (0.1) (1.3)   (1.0) (3.3)  
Operating Segments | Optical Services            
Segment Reporting Information [Line Items]            
Revenues 0.0 0.5   0.0 1.3  
Adjusted EBITDA 0.0 0.2   0.0 0.6  
Reconciliation of Adjusted EBITDA:            
Adjusted EBITDA 0.0 0.2   0.0 0.6  
All other            
Segment Reporting Information [Line Items]            
Adjusted EBITDA (19.6) (20.7)   (40.8) (39.8)  
Reconciliation of Adjusted EBITDA:            
Adjusted EBITDA $ (19.6) $ (20.7)   $ (40.8) $ (39.8)