Taxes (Details) - Schedule for components for deferred income taxes - USD ($) $ in Millions	May 31, 2018	May 31, 2017
Deferred tax assets
Tax uniform capitalization	$ 9.6	$ 9.5
Prepublication expenses	0.7	7.8
Inventory reserves	15.0	24.6
Allowance for doubtful accounts	2.2	3.3
Other reserves	16.9	26.0
Postretirement, post employment and pension obligations	7.1	12.5
Tax carryforwards	26.9	24.1
Other - net	13.7	14.8
Gross deferred tax assets	92.1	122.6
Valuation allowance	(25.1)	(24.8)
Total deferred tax assets	67.0	97.8
Deferred tax liabilities:
Prepaid expenses	(0.4)	(0.4)
Depreciation and amortization	(41.4)	(43.7)
Total deferred tax liability	(41.8)	(44.1)
Total net deferred tax assets	$ 25.2	$ 53.7