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Taxes (Details) - Schedule for components for deferred income taxes - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Deferred tax assets    
Tax uniform capitalization $ 24.9 $ 26.6
Inventory reserves 27.2 29.5
Allowance for doubtful accounts 3.9 4.9
Other reserves 27.0 26.4
Post-retirement, post-employment and pension obligations 15.6 15.5
Tax carryforwards 29.5 33.4
Lease accounting (0.4) (0.3)
Other - net 25.0 20.4
Gross deferred tax assets 152.7 156.4
Valuation allowance (28.3) (30.0)
Total deferred tax assets 124.4 126.4
Deferred tax liabilities    
Prepaid expenses (0.9) (1.0)
Depreciation and amortization (36.0) (40.3)
Total deferred tax liability (36.9) (41.3)
Total net deferred tax assets $ 87.5 $ 85.1