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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Deferred income tax assets:    
Inventory reserves $ 15.5 $ 15.2
Accrued expenses 13.6 15.3
Pension and other postretirement benefits 17.8 20.3
Stock-based compensation 8.9 10.7
State net operating losses 8.1 10.3
Federal net operating losses and credit carryovers 0.5 6.8
All other 3.0 1.9
Deferred income tax assets 67.4 80.5
Valuation allowance (1.3) (0.7)
Total deferred income tax assets 66.1 79.8
Deferred income tax liabilities:    
Identifiable intangible assets (182.3) (190.1)
Other (0.8) (1.5)
Total deferred income tax liabilities 183.1 191.6
Net deferred income tax liabilities $ 117.0 $ 111.8