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Consolidated Statement of Changes in Stockholders Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Statement of Stockholders' Equity [Abstract] |  |  |
Pension and postretirement adjustments, tax portion | $ (2.5) | $ 5.0 | $ 8.4

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- Definition Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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