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Taxes (Details) - Schedule for components for deferred income taxes - USD ($)
$ in Millions
May 31, 2017
May 31, 2016
Deferred tax assets    
Tax uniform capitalization $ 9.5 $ 6.2
Prepublication expenses 14.8 26.4
Inventory reserves 24.6 25.1
Allowance for doubtful accounts 3.3 4.2
Other reserves 26.0 26.3
Post-retirement, post-employment and pension obligations 12.5 15.9
Tax carryforwards 31.1 32.2
Lease accounting (0.4) (0.4)
Other - net 10.2 12.0
Gross deferred tax assets 131.6 147.9
Valuation allowance (26.8) (28.4)
Total deferred tax assets 104.8 119.5
Deferred tax liabilities    
Prepaid expenses (0.4) (0.6)
Depreciation and amortization (50.7) (50.4)
Total deferred tax liability (51.1) (51.0)
Total net deferred tax assets $ 53.7 $ 68.5