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Earnings per Share (Tables)
9 Months Ended
Jan. 31, 2020
Earnings Per Share [Abstract]  
Computation of earnings per common share, basic and diluted
The following table sets forth the computation of net income per common share and net income per common share – assuming dilution under the two-class method.
 Three Months Ended January 31,Nine Months Ended January 31,
 2020201920202019
Net income$187.4  $121.4  $553.2  $442.9  
Less: Net income allocated to participating securities1.1  0.6  3.2  2.3  
Net income allocated to common stockholders$186.3  $120.8  $550.0  $440.6  
Weighted-average common shares outstanding113.4  113.2  113.3  113.1  
Add: Dilutive effect of stock options—  —  —  —  
Weighted-average common shares outstanding – assuming dilution113.4  113.2  113.3  113.1  
Net income per common share$1.64  $1.07  $4.85  $3.89  
Net income per common share – assuming dilution$1.64  $1.07  $4.85  $3.89