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Earnings Per Share
 12 Months Ended
Dec. 31, 2024
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,
 202420232022
 (in millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to AGL$376 $739 124 
Less: Distributed and undistributed income (loss) available to nonvested shareholders3 6 1 
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$373 $733 123 
Basic shares53.3 58.4 62.9 
Basic EPS$7.01 $12.54 $1.95 
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$373 $733 $123 
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$373 $733 $123 
Basic shares53.3 58.4 62.9 
Dilutive securities:
Restricted stock awards1.0 1.2 1.0 
Diluted shares54.3 59.6 63.9 
Diluted EPS$6.87 $12.30 $1.92 
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect0.1 0.1 0.6