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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Deferred income tax assets:    
Inventory reserves $ 11.7 $ 10.4
Accrued expenses 10.0 13.3
Pension and other postretirement benefits 1.7 0.0
Stock-based compensation 2.7 3.3
State net operating losses 2.8 3.2
Federal net operating losses and credit carryovers 2.8 2.1
All other 2.4 1.0
Deferred income tax assets 34.1 33.3
Valuation allowance (2.8) (1.9)
Total deferred income tax assets 31.3 31.4
Deferred income tax liabilities:    
Identifiable intangible assets (95.6) (95.7)
Pension 0.0 2.3
Pension and other postretirement benefits 4.7 0.0
Other (18.9) (11.4)
Total deferred income tax liabilities 119.2 109.4
Net deferred income tax liabilities 87.9 78.0
Deferred Tax Liabilities, Gross, Noncurrent 88.0 79.2
Included in other noncurrent assets $ 0.1 $ 1.2