Taxes (Details) - Schedule for components for deferred income taxes (USD $) In Millions, unless otherwise specified	May 31, 2013	May 31, 2012
Deferred tax assets
Tax uniform capitalization	$ 25.8	$ 16.8
Inventory reserves	29.2	29.8
Allowance for doubtful accounts	5.4	7.8
Other reserves	26.3	41.2
Post-retirement, post-employment and pension obligations	12.6	23.1
Tax carryforwards	47.8	40.3
Lease accounting	11.7	10.1
Other - net	32.7	34.2
Gross deferred tax assets	191.5	203.3
Valuation allowance	(31.9)	(34.4)
Total deferred tax assets	159.6	168.9
Deferred tax liabilities
Prepaid expenses	(0.5)	(0.6)
Depreciation and amortization	(65.0)	(54.6)
Total deferred tax liability	(65.5)	(55.2)
Total net deferred tax assets	$ 94.1	$ 113.7