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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Jan. 31, 2022
Jan. 31, 2021
Earnings Per Share [Abstract]                
Net income $ 69.7 $ 206.0 $ 153.9 $ 261.5 $ 230.8 $ 237.0 $ 429.6 $ 729.3
Less: Net income allocated to participating securities 0.1     1.1     1.2 3.1
Net income allocated to common stockholders $ 69.6     $ 260.4     $ 428.4 $ 726.2
Weighted-average common shares outstanding (in shares) 108.1     112.1     108.1 113.1
Add: Dilutive effect of stock options (in shares) 0.1     0.0     0.0 0.0
Weighted-average common shares outstanding - assuming dilution (in shares) 108.2     112.1     108.1 113.1
Net income per common share (in dollars per share) $ 0.64     $ 2.32     $ 3.96 $ 6.42
Net Income - Assuming Dilution (in dollars per share) $ 0.64     $ 2.32     $ 3.96 $ 6.42