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Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Share based payments      
Share-based compensation expense included in selling, distribution, and administrative expenses $ 22.3 $ 22.1 $ 20.5
Share-based compensation expense included in other special project costs 1.2 0.8 0.8
Total share-based compensation expense 23.5 22.9 21.3
Related income tax benefit $ 8.0 $ 7.7 $ 7.1