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Pensions and Other Postretirement Benefits (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Changes in plan assets:      
Company contributions $ 15.7 $ 9.4 $ 40.0
Canadian Defined Benefit Plans [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 104.4 113.3  
Fair value of plan assets at end of year 104.1 105.6  
Funded status of the plans (0.3) (7.7)  
Components of net periodic benefit cost:      
Service cost 0.4 0.5  
Interest cost 4.3 4.2  
Expected return on plan assets (5.6) (5.8)  
Amortization of net actuarial loss (gain) 0.9 1.3  
Net periodic benefit cost 0.0 0.2  
Changes in plan assets:      
Company contributions 5.1 5.4  
Participant contributions 0.1 0.1  
Benefits paid (8.4) (8.6)  
Actual return on plan assets 11.9 10.6  
Foreign currency translation (10.3) (8.9)  
Canadian Other Postretirement Benefit Plans [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 10.9 11.4  
Fair value of plan assets at end of year 0.0 0.0  
Funded status of the plans (10.9) (11.4)  
Components of net periodic benefit cost:      
Service cost 0.0 0.0  
Interest cost 0.4 0.5  
Expected return on plan assets 0.0 0.0  
Amortization of net actuarial loss (gain) 0.0 0.0  
Net periodic benefit cost 0.4 0.5  
Changes in plan assets:      
Company contributions 0.7 0.8  
Participant contributions 0.0 0.0  
Benefits paid (0.7) (0.8)  
Actual return on plan assets 0.0 0.0  
Foreign currency translation $ 0.0 $ 0.0