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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Share
Computation of Earnings Per Share 
 Third QuarterNine Months
 2024202320242023
 (in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL$171 $157 $358 $363 
Less: Distributed and undistributed income (loss) available to nonvested shareholders
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$169 $155 $355 $360 
Basic shares52.4 58.5 54.1 58.9 
Basic EPS$3.23 $2.65 $6.57 $6.11 
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$169 $155 $355 $360 
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$169 $155 $355 $360 
Basic shares52.4 58.5 54.1 58.9 
Dilutive securities:
Restricted stock awards1.0 1.1 1.1 1.1 
Diluted shares53.4 59.6 55.2 60.0 
Diluted EPS$3.17 $2.60 $6.44 $5.99 
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect— 0.1 0.1 0.1 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Computation of Earnings Per Share 
 Third QuarterNine Months
 2024202320242023
 (in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL$171 $157 $358 $363 
Less: Distributed and undistributed income (loss) available to nonvested shareholders
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$169 $155 $355 $360 
Basic shares52.4 58.5 54.1 58.9 
Basic EPS$3.23 $2.65 $6.57 $6.11 
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic$169 $155 $355 $360 
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$169 $155 $355 $360 
Basic shares52.4 58.5 54.1 58.9 
Dilutive securities:
Restricted stock awards1.0 1.1 1.1 1.1 
Diluted shares53.4 59.6 55.2 60.0 
Diluted EPS$3.17 $2.60 $6.44 $5.99 
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect— 0.1 0.1 0.1