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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Earnings Per Share [Abstract]    
Net income $ 154.6 $ 133.0
Less: Net income allocated to participating securities 0.8 0.7
Net income allocated to common stockholders $ 153.8 $ 132.3
Weighted-average common shares outstanding (in shares) 113.2 113.1
Add: Dilutive effect of stock options (in shares) 0.1 0.0
Weighted-average common shares outstanding - assuming dilution (in shares) 113.3 113.1
Net income per common share (in dollars per share) $ 1.36 $ 1.17
Net Income - Assuming Dilution (in dollars per share) $ 1.36 $ 1.17