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Earnings Per Share (Details 1) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Earnings Per Share [Abstract]      
Net income $ 631.7 $ 876.3 $ 779.5
Weighted-average common shares outstanding (in shares) 107.9    
Weighted-average common shares outstanding – assuming dilution (in shares) 108.4    
Net income per common share - assuming dilution (in dollars per share) $ 5.83 $ 7.79 $ 6.84
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Add: Dilutive effect (in shares) 0.0    
Restricted shares, restricted stock units, and performance units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Add: Dilutive effect (in shares) 0.5