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Property and Equipment - Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Right-of-use finance lease asset $ 393.6 $ 298.4
Property and equipment, at cost 902.0 733.9
Less: Accumulated depreciation (272.3) (189.3)
Property and equipment, net 629.7 544.6
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost 11.2 11.1
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost 131.3 109.7
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost 24.4 20.7
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost 86.4 80.8
Medical equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost 221.0 196.8
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, excluding right-of-use finance lease asset, at cost $ 34.1 $ 16.4