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Earnings Per Share | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | 3. Earnings Per Share: Basic earnings per share are computed by dividing net income by the weighted-average number of common shares outstanding during the period. Diluted earnings per share are computed by dividing net income by the sum of the weighted-average number of shares and the number of equivalent shares assumed outstanding, if dilutive, under our stock-based compensation plans. The computations of basic and diluted earnings per share were as follows (in millions, except per share data):
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Net income | $ | 277.6 |  |  | $ | 245.9 |  |  | $ | 397.9 |  |  | $ | 370.2 |
Weighted-average shares outstanding – basic | 35.3 |  |  | 35.6 |  |  | 35.4 |  |  | 35.6 |
Add: Potential effect of dilutive securities attributable to stock-based payments | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |
Weighted-average shares outstanding – diluted | 35.5 |  |  | 35.8 |  |  | 35.6 |  |  | 35.8 |
Earnings per share – Basic: | $ | 7.86 |  |  | $ | 6.91 |  |  | $ | 11.24 |  |  | $ | 10.40 |
Earnings per share – Diluted: | $ | 7.82 |  |  | $ | 6.87 |  |  | $ | 11.18 |  |  | $ | 10.34 |
The following stock appreciation rights and restricted stock units were outstanding but not included in the diluted earnings per share calculation as the assumed exercise of such rights would have been anti-dilutive (in millions, except for per share data):
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Weighted-average number of shares | — |  |  | — |  |  | — |  |  | — |

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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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