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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Deferred income tax assets:    
Inventory reserves $ 12.0 $ 14.8
Accrued expenses 14.9 15.0
Pension and other postretirement benefits 6.0 25.0
Stock-based compensation 6.2 7.7
State net operating losses 3.2 5.0
Federal net operating losses and credit carryovers 0.9 0.6
All other 2.7 4.8
Deferred income tax assets 45.9 72.9
Valuation allowance (1.5) (0.9)
Total deferred income tax assets 44.4 72.0
Deferred income tax liabilities:    
Identifiable intangible assets (151.2) (177.0)
Other (7.2) (3.8)
Total deferred income tax liabilities 158.4 180.8
Net deferred income tax liabilities 114.0 108.8
Deferred Tax Liabilities, Gross, Noncurrent 115.1 109.9
Included in other noncurrent assets $ 1.1 $ 1.1