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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Deferred income tax assets:    
Accrued expenses $ 10.5 $ 12.7
Deferred Tax Assets Leasing Liabilities 8.1 8.2
Inventory reserves 7.0 6.1
State net operating losses 2.1 2.8
Federal net operating losses and credit carryovers 12.9 14.8
Pension and other postretirement benefits 0.1 0.0
Stock-based compensation 4.1 3.8
All other 2.3 2.9
Deferred income tax assets 47.1 51.3
Valuation allowance (13.2) (13.6)
Total deferred income tax assets 33.9 37.7
Deferred income tax liabilities:    
Identifiable intangible assets (77.7) (86.3)
Pension and other postretirement benefits 6.2 6.8
Pension 0.0 3.9
Deferred Tax Liabilities, Leasing Arrangements 7.4 7.6
Other (0.5) (0.5)
Total deferred income tax liabilities 120.2 132.5
Net deferred income tax liabilities 86.3 94.8
Deferred Tax Liabilities, Gross, Noncurrent 86.3 95.1
Deferred Tax Liabilities, Property, Plant and Equipment $ 28.4 $ 27.4