12. EARNINGS PER SHARE Basic earnings per share is determined by dividing net income by the weighted average common shares outstanding during the period. The calculation of diluted earnings per share includes the dilutive effect of non-vested restricted stock units. The computation of weighted average common shares outstanding excluded a nominal amount of anti-dilutive restricted stock units for each period ended June 30, 2025 and 2024. The computations for basic and diluted earnings per share for the three and six months ended June 30, 2025 and 2024 are as follows: | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2025 | | Six Months Ended June 30, 2025 | | | | | | Weighted | | Per | | | | | Weighted | | Per | | | | | | Average | | Common | | | | | Average | | Common | | | Net | | Common | | Share | | Net | | Common | | Share | (In millions, except per share amounts) | | Income | | Shares | | Amount | | Income | | Shares | | Amount | Basic | | $ | 94.7 | | 32.1 | | $ | 2.95 | | $ | 167.0 | | 32.5 | | $ | 5.14 | Effect of Dilutive Securities | | | | | 0.3 | | | (0.03) | | | | | 0.3 | | | (0.05) | Diluted | | $ | 94.7 | | 32.4 | | $ | 2.92 | | $ | 167.0 | | 32.8 | | $ | 5.09 |
| | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2024 | | Six Months Ended June 30, 2024 | | | | | | Weighted | | Per | | | | | Weighted | | Per | | | | | | Average | | Common | | | | | Average | | Common | | | Net | | Common | | Share | | Net | | Common | | Share | (In millions, except per share amounts) | | Income | | Shares | | Amount | | Income | | Shares | | Amount | Basic | | $ | 113.2 | | 33.9 | | $ | 3.34 | | $ | 149.3 | | 34.1 | | $ | 4.38 | Effect of Dilutive Securities | | | | | 0.3 | | | (0.03) | | | | | 0.4 | | | (0.05) | Diluted | | $ | 113.2 | | 34.2 | | $ | 3.31 | | $ | 149.3 | | 34.5 | | $ | 4.33 |
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