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Income Taxes - Temporary Differences and Approximate Tax Effects of Deferred Tax Asset and Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Medical malpractice liability $ 3.6 $ 4.0
Accrued vacation and incentive compensation 3.0 3.2
Net operating loss carryforwards 152.1 164.7
Allowance for bad debts 3.0 2.5
Capital loss carryforwards 0.0 1.7
Amortization of intangible assets 1.2 2.2
Deferred financing costs 8.3 7.9
Section 163(j) interest 99.4 69.8
Interest rate swap liability 15.0 15.8
TRA liability 0.6 1.0
Right of use 51.1 50.6
Other deferred assets 11.1 16.4
Total gross deferred tax assets 348.4 339.8
Less: Valuation allowance (113.0) (91.1)
Total deferred tax assets 235.4 248.7
Deferred tax liabilities:    
Depreciation on property and equipment (2.6) (1.8)
Basis differences of partnerships and joint ventures (73.0) (73.6)
Right of use (44.2) (47.5)
Other deferred liabilities (1.2) (1.0)
Total deferred tax liabilities (121.0) (123.9)
Net deferred tax assets $ 114.4 $ 124.8