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Working Capital (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	May 31, 2011
Working Capital [Abstract]
Working capital	$ 176.8		$ 249.2
Allowances for doubtful receivables	3.9		3.9
Provisions for bad debts	0.2	1.4
Uncollectible accounts written off	0.2	1.6
Amount inventory values would be higher by average cost method	$ 42.9		$ 44.6

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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