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Earnings Per Share | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Computation of Earnings Per Share
| Third Quarter |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
| (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL | $ | 157 |  |  | $ | 11 |  |  | $ | 363 |  |  | $ | 30 |
Less: Distributed and undistributed income (loss) available to nonvested shareholders | 2 |  |  | — |  |  | 3 |  |  | — |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 155 |  |  | $ | 11 |  |  | $ | 360 |  |  | $ | 30 |
Basic shares | 58.5 |  |  | 61.7 |  |  | 58.9 |  |  | 63.9 |
Basic EPS | $ | 2.65 |  |  | $ | 0.18 |  |  | $ | 6.11 |  |  | $ | 0.47 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 155 |  |  | $ | 11 |  |  | $ | 360 |  |  | $ | 30 |
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 | $ | 155 |  |  | $ | 11 |  |  | $ | 360 |  |  | $ | 30 |
Basic shares | 58.5 |  |  | 61.7 |  |  | 58.9 |  |  | 63.9 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards | 1.1 |  |  | 1.2 |  |  | 1.1 |  |  | 1.2 |
Diluted shares | 59.6 |  |  | 62.9 |  |  | 60.0 |  |  | 65.1 |
Diluted EPS | $ | 2.60 |  |  | $ | 0.18 |  |  | $ | 5.99 |  |  | $ | 0.46 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.8 |

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