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Taxes (Details) - Schedule for components for deferred income taxes - USD ($)
$ in Millions
May 31, 2019
May 31, 2018
Deferred tax assets    
Tax uniform capitalization $ 12.8 $ 9.6
Prepublication expenses 1.2 0.7
Inventory reserves 15.1 15.0
Allowance for doubtful accounts 1.9 2.2
Deferred revenue 23.5 0.0
Other reserves 17.2 16.9
Postretirement, post employment and pension obligations 6.0 7.1
Tax carryforwards 31.8 26.9
Other - net 13.7 13.7
Gross deferred tax assets 123.2 92.1
Valuation allowance (25.7) (25.1)
Total deferred tax assets 97.5 67.0
Deferred tax liabilities:    
Prepaid expenses (0.2) (0.4)
Depreciation and amortization (60.3) (41.4)
Total deferred tax liability (60.5) (41.8)
Total net deferred tax assets $ 37.0 $ 25.2