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Pensions and Other Postretirement Benefits (Details 3) - 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
Defined benefit pensions (188.9) (135.7)  
Postretirement benefits other than pensions (74.6) (58.5)  
Defined Benefit Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 542.3 575.7  
Service cost 9.0 8.7 8.8
Interest cost 23.2 21.8 23.9
Amendments 0.3 0.0  
Actuarial loss (gain) 39.8 (19.7)  
Participant contributions 0.1 0.1  
Benefits paid (31.8) (34.2)  
Foreign currency translation adjustments (10.6) (10.1)  
Settlement (8.6) 0.0  
Acquisition 176.7 0.0  
Other adjustments 0.0 0.0  
Benefit obligation at end of year 740.4 542.3 575.7
Changes in plan assets:      
Fair value of plan assets at beginning of year 402.1 410.7  
Actual return on plan assets 41.7 25.0  
Company contributions 15.7 9.4  
Participant contributions 0.1 0.1  
Benefits paid (31.8) (34.2)  
Settlement (8.6) 0.0  
Acquisition 141.1 0.0  
Foreign currency translation adjustments (10.3) (8.9)  
Fair value of plan assets at end of year 550.0 402.1 410.7
Funded status of the plans (190.4) (140.2)  
Defined benefit pensions (188.9) (135.7)  
Other noncurrent assets 2.0 0.0  
Accrued compensation (3.5) (4.5)  
Postretirement benefits other than pensions 0.0 0.0  
Net benefit liability (190.4) (140.2)  
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 58.5 67.1  
Service cost 2.3 2.3 2.5
Interest cost 2.4 2.3 3.0
Amendments 0.0 (1.7)  
Actuarial loss (gain) (1.6) (7.5)  
Participant contributions 0.7 1.2  
Benefits paid (4.4) (3.5)  
Foreign currency translation adjustments (1.1) (1.1)  
Settlement 0.0 0.0  
Acquisition 18.9 0.0  
Other adjustments 0.1 (0.6)  
Benefit obligation at end of year 75.8 58.5 67.1
Changes in plan assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Company contributions 3.7 2.3  
Participant contributions 0.7 1.2  
Benefits paid (4.4) (3.5)  
Settlement 0.0 0.0  
Acquisition 0.0 0.0  
Foreign currency translation adjustments 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded status of the plans (75.8) (58.5)  
Defined benefit pensions 0.0 0.0  
Other noncurrent assets 0.0 0.0  
Accrued compensation (1.2) 0.0  
Postretirement benefits other than pensions (74.6) (58.5)  
Net benefit liability $ (75.8) $ (58.5)