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Income Taxes (Details 5) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Reconciliation of unrecognized tax benefits      
Balance at May 1, $ 29.1 $ 29.7 $ 24.0
Increases:      
Current year tax positions 2.4 5.1 4.8
Prior year tax positions 1.2 0.1 2.5
Acquired businesses 13.4 0.0 0.0
Decreases:      
Prior year tax positions 0.4 1.6 0.2
Settlement with tax authorities 0.0 1.5 1.0
Expiration of statute of limitations periods 0.7 2.7 0.4
Balance at April 30, $ 45.0 $ 29.1 $ 29.7