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Earnings Per Share | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Computation of Earnings Per Share
| Second Quarter |  | Six Months
| 2023 |  | 2022 |  | 2023 |  | 2022
| (in millions, except per share amounts)
Basic Earnings Per Share (EPS): |  |  |  |  |  |  |
Net income (loss) attributable to AGL | $ | 125 |  |  | $ | (47) |  |  | $ | 206 |  |  | $ | 19 |
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 | $ | 124 |  |  | $ | (47) |  |  | $ | 205 |  |  | $ | 19 |
Basic shares | 59.2 |  |  | 63.8 |  |  | 59.1 |  |  | 65.0 |
Basic EPS | $ | 2.09 |  |  | $ | (0.74) |  |  | $ | 3.46 |  |  | $ | 0.29 |
Diluted EPS: |  |  |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 124 |  |  | $ | (47) |  |  | $ | 205 |  |  | $ | 19 |
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 | $ | 124 |  |  | $ | (47) |  |  | $ | 205 |  |  | $ | 19 |
Basic shares | 59.2 |  |  | 63.8 |  |  | 59.1 |  |  | 65.0 |
Dilutive securities: |  |  |  |  |  |  |
Restricted stock awards | 0.9 |  |  | — |  |  | 1.2 |  |  | 1.2 |
Diluted shares | 60.1 |  |  | 63.8 |  |  | 60.3 |  |  | 66.2 |
Diluted EPS | $ | 2.06 |  |  | $ | (0.74) |  |  | $ | 3.40 |  |  | $ | 0.29 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect | 0.2 |  |  | 2.1 |  |  | 0.1 |  |  | 1.2 |

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