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Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2026
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share The following table presents net income, the weighted average common shares used in calculating basic EPS and those used in calculating diluted EPS for each period presented below. Diluted EPS reflects the incremental common shares from common shares issuable upon vesting of performance share units (“PSUs”) and the purchase of shares under the Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method. The outstanding restricted stock units (“RSUs”) have non-forfeitable rights to dividend equivalents and are therefore included in calculating basic and diluted EPS under the two-class method.
| Three Months Ended March 31, |  |
| 2026 |  | 2025 |  |  |  |
Numerator |  |  |  |  |  |  |
Net income | $ | 274.1 |  |  | $ | 146.6 |  |  |  |  |
Less: Earnings allocated to participating securities | (2.3) |  |  | (1.4) |  |  |  |  |
Net income used in basic and diluted per common share calculations | $ | 271.8 |  |  | $ | 145.2 |  |  |  |  |
Denominator |  |  |  |  |  |  |
Weighted average common shares outstanding used in basic per common share calculations | 49,702,511 |  |  | 50,799,019 |  |  |  |  |
Incremental common shares from: |  |  |  |  |  |  |
PSUs | 494,763 |  |  | 449,697 |  |  |  |  |
ESPP | 273 |  |  | — |  |  |  |  |
Weighted average common shares outstanding used in diluted per common share calculations | 50,197,547 |  |  | 51,248,716 |  |  |  |  |
Earnings per common share – Basic | $ | 5.47 |  |  | $ | 2.86 |  |  |  |  |
Earnings per common share – Diluted | $ | 5.41 |  |  | $ | 2.83 |  |  |  |  |
Average PSUs totaling 15,745 and 15,279 for the three months ended March 31, 2026 and 2025, respectively, were anti-dilutive and thus not included in the computation of diluted EPS under the treasury stock method.

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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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