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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Deferred income tax assets:    
Inventory reserves $ 10.4 $ 12.0
Accrued expenses 13.3 14.9
Pension and other postretirement benefits 0.0 6.0
Stock-based compensation 3.3 6.2
State net operating losses 3.2 3.2
Federal net operating losses and credit carryovers 2.1 0.9
All other 1.0 2.7
Deferred income tax assets 33.3 45.9
Valuation allowance (1.9) (1.5)
Total deferred income tax assets 31.4 44.4
Deferred income tax liabilities:    
Identifiable intangible assets (95.7) (151.2)
Pension and other postretirement benefits 2.3 0.0
Other (11.4) (7.2)
Total deferred income tax liabilities 109.4 158.4
Net deferred income tax liabilities 78.0 114.0
Deferred Tax Liabilities, Gross, Noncurrent 79.2 115.1
Included in other noncurrent assets $ 1.2 $ 1.1