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Consolidated Statement of Changes in Stockholders Equity (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
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