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Earnings Per Share | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Our basic earnings per share calculations are based on the weighted average number of common shares outstanding during the period. Potentially dilutive securities include outstanding stock options, restricted share units, deferred stock units and performance-based restricted share units. The effect of potentially dilutive securities is reflected in diluted earnings per common share by application of the treasury method. Diluted earnings per share gives effect to all potentially dilutive common shares outstanding during the period.
|  |  | Three Months Ended
|  |  | March 31,
(in millions, except per share data) |  |  |  |  | 2025 |  | 2024
Net income attributable to common shareholders |  |  |  |  | $ | 21.7 |  |  | $ | 37.8 |
Average basic shares outstanding |  |  |  |  | 57.3 |  | 57.0 |
Effect of dilutive share-based awards |  |  |  |  | 0.6 |  |  | 0.7 |
Average diluted shares outstanding |  |  |  |  | 57.9 |  |  | 57.7 |
Earnings per basic share |  |  |  |  | $ | 0.38 |  |  | $ | 0.66 |
Earnings per diluted share |  |  |  |  | $ | 0.38 |  |  | $ | 0.66 |
Stock options, restricted share units, deferred stock units and performance-based restricted share units that were excluded from the calculation of diluted earnings per share because their effect is anti‑dilutive were 0.3 million and 0.3 million for the three months ended March 31, 2025, and 2024, respectively.

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