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Income Taxes - Temporary Differences and Approximate Tax Effects of Deferred Tax Asset and Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Medical malpractice liability $ 4.1 $ 3.6
Accrued vacation and incentive compensation 3.1 3.0
Net operating loss carryforwards 146.0 152.1
Allowance for bad debts 2.9 3.0
Amortization of intangible assets 0.0 1.2
Deferred financing costs 5.1 8.3
Section 163(j) interest 137.7 99.4
Interest rate derivative liability 10.5 15.0
TRA liability 0.1 0.6
Right of use 52.5 51.1
Software development costs 1.0 0.0
Other deferred assets 9.2 11.1
Total gross deferred tax assets 372.2 348.4
Less: Valuation allowance (114.7) (113.0)
Total deferred tax assets 257.5 235.4
Deferred tax liabilities:    
Depreciation on property and equipment (2.0) (2.6)
Basis differences of partnerships and joint ventures (87.4) (73.0)
Right of use (44.4) (44.2)
Amortization of intangible assets (1.3) 0.0
Interest rate derivative asset (29.5) 0.0
Other deferred liabilities (1.4) (1.2)
Total deferred tax liabilities (166.0) (121.0)
Net deferred tax assets $ 91.5 $ 114.4