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Consolidated Statement of Changes in Stockholders' Equity and Comprehensive Income (Loss) (Parentheticals) (USD $) In Millions	12 Months Ended
	May 31, 2011	May 31, 2010	May 31, 2009
Pension and postretirement adjustments, tax portion	$ 4.0	$ (9.1)	$ (3.4)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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