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Earnings Per Share | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Computation of Earnings Per Share
|  |  | First Quarter
|  |  |  |  | 2025 |  | 2024
|  |  |  |  | (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL |  |  |  |  | $ | 176 |  |  | $ | 109 |
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 |  |  |  |  | $ | 175 |  |  | $ | 108 |
Basic shares |  |  |  |  | 50.0 |  |  | 55.6 |
Basic EPS |  |  |  |  | $ | 3.49 |  |  | $ | 1.94 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic |  |  |  |  | $ | 175 |  |  | $ | 108 |
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 |  |  |  |  | $ | 175 |  |  | $ | 108 |
Basic shares |  |  |  |  | 50.0 |  |  | 55.6 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards |  |  |  |  | 0.7 |  |  | 1.5 |
Diluted shares |  |  |  |  | 50.7 |  |  | 57.1 |
Diluted EPS |  |  |  |  | $ | 3.44 |  |  | $ | 1.89 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect |  |  |  |  | 0.1 |  |  | 0.1 |

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