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Earnings Per Share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Accounting Policy The Company computes earnings per share (EPS) using the two-class method, which is an earnings allocation formula that determines EPS for: (i) each class of common shares (the Company has a single class of common shares); and (ii) participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. Awards and share units under the AGS SERP with non-forfeitable dividends are considered participating securities. Basic EPS is computed by dividing net income (loss) available to common shareholders of Assured Guaranty by the weighted-average number of common shares outstanding during the period. Diluted EPS adjusts basic EPS for the effects of restricted stock, restricted stock units, stock options and other potentially dilutive financial instruments (dilutive securities), only in the periods in which such effect is dilutive. The effect of the dilutive securities is reflected in diluted EPS by application of the more dilutive of: (1) the treasury stock method; or (2) the two-class method assuming nonvested shares are not converted into common shares. Computation of Earnings Per Share
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| (in millions, except per share amounts)
Basic EPS: |  |  |  |  |
Net income (loss) attributable to AGL | $ | 124 |  |  | $ | 389 |  |  | 362 |
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 | $ | 123 |  |  | $ | 389 |  |  | 361 |
Basic shares | 62.9 |  |  | 73.5 |  |  | 85.5 |
Basic EPS | $ | 1.95 |  |  | $ | 5.29 |  |  | $ | 4.22 |
Diluted EPS: |  |  |  |  |
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic | $ | 123 |  |  | $ | 389 |  |  | $ | 361 |
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 | $ | 123 |  |  | $ | 389 |  |  | $ | 361 |
Basic shares | 62.9 |  |  | 73.5 |  |  | 85.5 |
Dilutive securities: |  |  |  |  |
Options and restricted stock awards | 1.0 |  |  | 0.8 |  |  | 0.7 |
Diluted shares | 63.9 |  |  | 74.3 |  |  | 86.2 |
Diluted EPS | $ | 1.92 |  |  | $ | 5.23 |  |  | $ | 4.19 |
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect | 0.6 |  |  | 0.1 |  |  | 0.8 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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