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Earnings Per Share
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
 
Computation of Earnings Per Share
 Third QuarterNine Months
 2025202420252024
 (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 shareholders1 2 2 3 
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$104 $169 $382 $355 
Basic shares47.4 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 shares47.4 52.4 48.8 54.1 
Dilutive securities:
Restricted stock awards0.6 1.0 0.6 1.1 
Diluted shares48.0 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