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Discontinued Operations (Details2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Discontinued Operations and Disposal Groups [Abstract]      
Revenues $ 0 $ 6.2 $ 9.8
Gain (loss) on sale 0 (1.1) 0
Earnings (loss) before income taxes 0.2 (7.2) (7.2)
Income tax benefit (provision) (0.1) 2.5 1.5
Earnings (loss) from discontinued operations, net of tax $ 0.1 $ (4.7) $ (5.7)