Taxes (Details) - Schedule for components for deferred income taxes - USD ($) $ in Millions	May 31, 2020	May 31, 2019
Deferred tax assets
Tax uniform capitalization	$ 10.4	$ 12.8
Prepublication expenses	0.8	1.2
Inventory reserves	10.3	15.1
Allowance for doubtful accounts	2.9	1.9
Deferred revenue	0.0	23.5
Other reserves	18.0	17.2
Postretirement, post employment and pension obligations	5.3	6.0
Tax carryforwards	51.1	31.8
Lease Liabilities	25.2
Other	11.9	13.7
Gross deferred tax assets	135.9	123.2
Valuation allowance	(31.3)	(25.7)
Total deferred tax assets	104.6	97.5
Deferred tax liabilities:
Depreciation and amortization	(65.8)	(60.3)
Lease Right of Use Assets	(24.4)
Prepaid expenses	(0.2)	(0.2)
Other	(1.9)
Total deferred tax liability	(92.3)	(60.5)
Total net deferred tax assets	$ 12.3	$ 37.0