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Segment Reporting - Revenues and Operating Income by Reportable Segment (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 3    
Segment Reporting Information [Line Items]      
Revenues $ 1,860,100,000 $ 1,831,400,000 $ 1,771,500,000
Adjusted EBITDA 256,600,000 258,600,000 234,800,000
Reconciliation of Adjusted EBITDA:      
(Loss) income before income taxes (18,800,000) 54,600,000 (69,200,000)
Less: Net income attributable to non-controlling interests (117,400,000) (119,900,000) (110,100,000)
Depreciation and amortization 94,800,000 76,500,000 67,400,000
Interest expense, net 201,800,000 178,900,000 147,000,000.0
Equity-based compensation expense 13,200,000 10,200,000 9,300,000
Transaction, integration and acquisition costs 38,200,000 36,100,000 34,000,000.0
Impairment charges 33,500,000 7,900,000 74,400,000
Loss (gain) on disposals and deconsolidations, net 5,700,000 (4,400,000) 31,800,000
Litigation settlements and other litigation costs 6,400,000 4,600,000 46,000,000.0
Reserve adjustments 0 0 2,700,000
Contingent acquisition compensation expense 0 0 1,500,000
Gain on escrow release (800,000) 0 0
Loss on debt extinguishment 0 11,700,000 0
Tax receivable agreement expense 0 2,400,000 0
Transaction and integration costs 23,200,000 19,000,000.0 31,700,000
Acquisition costs 6,600,000   2,300,000
Start-up costs related to de novo surgical hospital 15,000,000.0 17,100,000  
Litigation settlement 1,200,000 200,000 46,000,000.0
Other litigation costs 5,200,000 4,400,000 0
All other      
Segment Reporting Information [Line Items]      
Adjusted EBITDA (80,700,000) (74,300,000) (80,200,000)
Surgical Facility Services | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 1,793,400,000 1,748,200,000 1,682,400,000
Adjusted EBITDA 339,300,000 328,900,000 309,500,000
Ancillary Services | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 63,600,000 79,400,000 79,600,000
Adjusted EBITDA (3,400,000) 2,600,000 3,000,000.0
Optical Services | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 3,100,000 3,800,000 9,500,000
Adjusted EBITDA $ 1,400,000 $ 1,400,000 $ 2,500,000