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Earnings Per Share Attributable to Common Stockholders | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Share Attributable to Common Stockholders | Note 8. Earnings Per Share Available to Common Stockholders
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Net income available to common stockholders |  | $ | 80.7 |  |  | $ | 66.9 |  |  | $ | 283.1 |  |  | $ | 264.7 |
Basic weighted average shares outstanding |  | 185.6 |  | 184.3 |  | 185.3 |  | 183.8
Weighted average effect of dilutive securities: |  |  |  |  |  |  |  |
Share units |  | 0.9 |  | 0.6 |  | 0.8 |  | 0.6
Stock options and employee share purchase plan |  | 0.6 |  | 0.6 |  | 0.6 |  | 0.6
Diluted weighted average shares outstanding |  | 187.1 |  | 185.5 |  | 186.7 |  | 185.0
Earnings per share available to common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 0.43 |  |  | $ | 0.36 |  |  | $ | 1.53 |  |  | $ | 1.44 |
Diluted |  | $ | 0.43 |  |  | $ | 0.36 |  |  | $ | 1.52 |  |  | $ | 1.43 |

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