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Earnings Per Share | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings per Share We compute basic and diluted earnings per share using the two-class method, which is an earnings allocation calculation that determines Earnings Per Share ("EPS") for each class of common stock and participating security. Our vested and exercisable stock options contain non-forfeitable rights to dividends or dividend equivalents and are classified as participating securities in the calculation of EPS. Our unvested stock options, restricted stock units, performance shares and non-employee director awards do not contain nonforfeitable rights to dividends or dividend equivalents and are therefore not classified as participating securities. The following table shows the computation of our basic and diluted earnings per common share (in millions, except per share amounts):
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2025 |  | 2024 |  | 2025 |  | 2024
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 82.2 |  |  | $ | 89.0 |  |  | $ | 236.3 |  |  | $ | 207.7 |
Less: Net income allocated to participating securities | (1.3) |  |  | (1.5) |  |  | (4.0) |  |  | (3.7) |
Net income available to common shareholders | $ | 80.9 |  |  | $ | 87.5 |  |  | $ | 232.3 |  |  | $ | 204.0 |
Weighted-average shares outstanding - basic | 35.9 |  |  | 35.8 |  |  | 35.9 |  |  | 35.8 |
Basic earnings per share | $ | 2.25 |  |  | $ | 2.44 |  |  | $ | 6.47 |  |  | $ | 5.70 |
Diluted earnings per share: |  |  |  |  |  |  |
Net income | $ | 82.2 |  |  | $ | 89.0 |  |  | $ | 236.3 |  |  | $ | 207.7 |
Less: Net income allocated to participating securities | (1.3) |  |  | (1.5) |  |  | (4.0) |  |  | (3.7) |
Net income available to common shareholders | $ | 80.9 |  |  | $ | 87.5 |  |  | $ | 232.3 |  |  | $ | 204.0 |
Weighted-average shares outstanding - basic | 35.9 |  |  | 35.8 |  |  | 35.9 |  |  | 35.8 |
Effect of dilutive securities: |  |  |  |  |  |  |
Equity compensation plans | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Weighted-average shares outstanding - diluted | 36.0 |  |  | 35.9 |  |  | 36.0 |  |  | 35.9 |
Diluted earnings per share | $ | 2.25 |  |  | $ | 2.43 |  |  | $ | 6.46 |  |  | $ | 5.68 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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