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 July 31, | | 2019 | | 2018 | 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 | 113.2 |
| | 113.1 |
| Add: Dilutive effect of stock options | 0.1 |
| | — |
| Weighted-average common shares outstanding – assuming dilution | 113.3 |
| | 113.1 |
| Net income per common share | $ | 1.36 |
| | $ | 1.17 |
| Net income per common share – assuming dilution | $ | 1.36 |
| | $ | 1.17 |
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