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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Deferred income tax assets:    
Inventory reserves $ 14.8 $ 15.5
Accrued expenses 15.0 13.6
Pension and other postretirement benefits 25.0 17.8
Stock-based compensation 7.7 8.9
State net operating losses 5.0 8.1
Federal net operating losses and credit carryovers 0.6 0.5
All other 4.8 3.0
Deferred income tax assets 72.9 67.4
Valuation allowance (0.9) (1.3)
Total deferred income tax assets 72.0 66.1
Deferred income tax liabilities:    
Identifiable intangible assets (177.0) (182.3)
Other (3.8) (0.8)
Total deferred income tax liabilities 180.8 183.1
Net deferred income tax liabilities $ 108.8 $ 117.0