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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Deferred income tax assets:    
Accrued expenses $ 12.7 $ 12.2
Deferred Tax Assets Leasing Liabilities 8.2 7.3
Inventory reserves 6.1 4.6
State net operating losses 2.8 3.0
Federal net operating losses and credit carryovers 14.8 3.0
Pension and other postretirement benefits 0.0 0.2
Stock-based compensation 3.8 2.6
All other 2.9 1.1
Deferred income tax assets 51.3 34.0
Valuation allowance (13.6) (2.9)
Total deferred income tax assets 37.7 31.1
Deferred income tax liabilities:    
Identifiable intangible assets (86.3) (90.2)
Pension and other postretirement benefits 6.8 5.0
Pension 3.9 0.0
Deferred Tax Liabilities, Leasing Arrangements 7.6 6.6
Other (0.5) (0.5)
Total deferred income tax liabilities 132.5 127.4
Net deferred income tax liabilities 94.8 96.3
Deferred Tax Liabilities, Gross, Noncurrent 95.1 96.5
Deferred Tax Liabilities, Property, Plant and Equipment $ 27.4 $ 25.1