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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
Year Ended September 30,
202120202019
Current:
Federal$9.2 $10.7 $33.6 
State1.7 2.0 5.0 
Foreign(0.6)(0.2)0.3 
10.3 12.5 38.9 
Deferred:
Federal(1.3)(2.0)0.2 
State(0.2)(1.3)0.3 
Foreign— — — 
(1.5)(3.3)0.5 
Income tax expense$8.8 $9.2 $39.4 
Schedule of effective income tax rate reconciliation
Year Ended September 30,
202120202019
Computed tax (21%)$25.9 $23.0 $34.1 
Income tax expense attributable to NCI(19.5)(16.2)— 
State income taxes, net of effect on federal tax4.0 3.0 4.9 
Tax-deductible transaction costs— (1.2)— 
Uncertain tax position— 1.5 — 
Other, net (none in excess of 5% of computed tax)(1.6)(0.9)0.4 
Income tax expense$8.8 $9.2 $39.4 
Schedule of deferred tax assets and liabilities
September 30, 2021September 30, 2020
AssetsLiabilitiesNetAssetsLiabilitiesNet
Stock-based compensation awards0.1 — 0.1 — — — 
Accrued liabilities2.5 — 2.5 2.6 — 2.6 
Intangible assets1.0 — 1.0 1.0 — 1.0 
Investment in partnership (a)— (11.2)(11.2)— (12.6)(12.6)
Deferred income taxes$3.6 $(11.2)$(7.6)$3.6 $(12.6)$(9.0)
Summary of income tax contingencies
Year Ended September 30,
202120202019
Balance, beginning of year$1.5 $— $0.5 
Additions for tax positions taken in current year and acquisitions— 1.5 — 
Reductions for tax positions taken in prior years— — (0.5)
Balance, end of year$1.5 $1.5 $—