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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2026
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Share | Computation of Earnings Per Share
|  |  | First Quarter
|  |  |  |  | 2026 |  | 2025
|  |  |  |  | (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL |  |  |  |  | $ | 88 |  |  | $ | 176 |
Less: Distributed and undistributed income (loss) available to nonvested shareholders |  |  |  |  | 1 |  |  | 1 |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic |  |  |  |  | $ | 87 |  |  | $ | 175 |
Basic shares |  |  |  |  | 44.9 |  |  | 50.0 |
Basic EPS |  |  |  |  | $ | 1.94 |  |  | $ | 3.49 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic |  |  |  |  | $ | 87 |  |  | $ | 175 |
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries |  |  |  |  | — |  |  | — |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted |  |  |  |  | $ | 87 |  |  | $ | 175 |
Basic shares |  |  |  |  | 44.9 |  |  | 50.0 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards |  |  |  |  | 0.5 |  |  | 0.7 |
Diluted shares |  |  |  |  | 45.4 |  |  | 50.7 |
Diluted EPS |  |  |  |  | $ | 1.91 |  |  | $ | 3.44 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect |  |  |  |  | 0.2 |  |  | 0.1 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | Computation of Earnings Per Share
|  |  | First Quarter
|  |  |  |  | 2026 |  | 2025
|  |  |  |  | (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL |  |  |  |  | $ | 88 |  |  | $ | 176 |
Less: Distributed and undistributed income (loss) available to nonvested shareholders |  |  |  |  | 1 |  |  | 1 |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic |  |  |  |  | $ | 87 |  |  | $ | 175 |
Basic shares |  |  |  |  | 44.9 |  |  | 50.0 |
Basic EPS |  |  |  |  | $ | 1.94 |  |  | $ | 3.49 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic |  |  |  |  | $ | 87 |  |  | $ | 175 |
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries |  |  |  |  | — |  |  | — |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted |  |  |  |  | $ | 87 |  |  | $ | 175 |
Basic shares |  |  |  |  | 44.9 |  |  | 50.0 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards |  |  |  |  | 0.5 |  |  | 0.7 |
Diluted shares |  |  |  |  | 45.4 |  |  | 50.7 |
Diluted EPS |  |  |  |  | $ | 1.91 |  |  | $ | 3.44 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect |  |  |  |  | 0.2 |  |  | 0.1 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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