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Pensions and Other Postretirement Benefits (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Change in plan assets:      
Company contributions $ 39.6 $ 28.7 $ 8.6
Defined benefit pensions (144.1) (189.8)  
Other postretirement benefits (61.9) (66.6)  
Defined Benefit Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 677.3 745.9  
Service cost 5.2 12.7 17.8
Interest cost 21.6 25.3 27.7
Amendments 0.0 0.0  
Actuarial loss (gain) (10.8) 6.7  
Benefits paid 36.0 43.8  
Foreign currency translation adjustments 5.8 (7.8)  
Curtailment 0.0 (30.9)  
Settlement (23.4) (30.8)  
Benefit obligation at end of year 639.7 677.3 745.9
Change in plan assets:      
Fair value of plan assets at beginning of year 489.2 505.6  
Actual return on plan assets 21.5 37.4  
Company contributions 39.6 28.7  
Benefits paid (36.0) (43.8)  
Settlement (23.4) (30.8)  
Foreign currency translation adjustments 6.1 (7.9)  
Fair value of plan assets at end of year 497.0 489.2 505.6
Funded status of the plans (142.7) (188.1)  
Defined benefit pensions (144.1) (189.8)  
Other noncurrent assets 9.5 5.7  
Accrued compensation (8.1) (4.0)  
Other postretirement benefits 0.0 0.0  
Net benefit liability (142.7) (188.1)  
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 70.7 75.9  
Service cost 2.0 2.3 2.3
Interest cost 2.1 2.6 2.8
Amendments 0.2 (3.0)  
Actuarial loss (gain) (5.5) (2.3)  
Benefits paid 4.3 3.9  
Foreign currency translation adjustments 0.7 (0.8)  
Curtailment 0.0 (0.1)  
Settlement 0.0 0.0  
Benefit obligation at end of year 65.9 70.7 75.9
Change 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 4.3 3.9  
Benefits paid (4.3) (3.9)  
Settlement 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 (65.9) (70.7)  
Defined benefit pensions 0.0 0.0  
Other noncurrent assets 0.0 0.0  
Accrued compensation (4.0) (4.1)  
Other postretirement benefits (61.9) (66.6)  
Net benefit liability $ (65.9) $ (70.7)