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Earnings Per Share Attributable to Common Stockholders | 9 Months Ended
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Sep. 30, 2024
Earnings Per Share [Abstract] |
Earnings Per Share Attributable to Common Stockholders | 8. Earnings Per Share Available to Common Stockholders The following table details the computation of basic and diluted earnings per share:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Net income available to common stockholders |  | $ | 66.9 |  |  | $ | 54.7 |  |  | $ | 264.7 |  |  | $ | 99.1 |
Denominator: |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  | 184,304,993 |  | 182,148,717 |  | 183,752,510 |  | 161,724,677
Weighted average effect of dilutive securities: |  |  |  |  |  |  |  |
Share units |  | 590,407 |  | 875,477 |  | 617,090 |  | 655,762
Stock options and employee share purchase plan |  | 604,588 |  | 577,407 |  | 630,299 |  | 536,154
Diluted weighted average shares outstanding |  | 185,499,988 |  |  | 183,601,601 |  |  | 184,999,899 |  |  | 162,916,593 |
Earnings per share available to common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 0.36 |  |  | $ | 0.30 |  |  | $ | 1.44 |  |  | $ | 0.61 |
Diluted |  | $ | 0.36 |  |  | $ | 0.30 |  |  | $ | 1.43 |  |  | $ | 0.61 |

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