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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 Computation of Earnings Per Share
| Third Quarter |  | Nine Months
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL | $ | 105 |  |  | $ | 171 |  |  | $ | 384 |  |  | $ | 358 |
Less: Distributed and undistributed income (loss) available to nonvested shareholders | 1 |  |  | 2 |  |  | 2 |  |  | 3 |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 104 |  |  | $ | 169 |  |  | $ | 382 |  |  | $ | 355 |
Basic shares | 47.4 |  |  | 52.4 |  |  | 48.8 |  |  | 54.1 |
Basic EPS | $ | 2.20 |  |  | $ | 3.23 |  |  | $ | 7.82 |  |  | $ | 6.57 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 104 |  |  | $ | 169 |  |  | $ | 382 |  |  | $ | 355 |
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 | $ | 104 |  |  | $ | 169 |  |  | $ | 382 |  |  | $ | 355 |
Basic shares | 47.4 |  |  | 52.4 |  |  | 48.8 |  |  | 54.1 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards | 0.6 |  |  | 1.0 |  |  | 0.6 |  |  | 1.1 |
Diluted shares | 48.0 |  |  | 53.4 |  |  | 49.4 |  |  | 55.2 |
Diluted EPS | $ | 2.18 |  |  | $ | 3.17 |  |  | $ | 7.73 |  |  | $ | 6.44 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect | — |  |  | — |  |  | 0.1 |  |  | 0.1 |

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