Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share 

	Second Quarter				Six Months
	2020		2019		2020		2019
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	183	$	142	$	128	$	196
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—		—		—		—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	183	$	142	$	128	$	196
Basic shares	86.5		101.2		89.5		102.1
Basic EPS	$	2.11	$	1.40	$	1.43	$	1.92
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	183	$	142	$	128	$	196
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	$	183	$	142	$	128	$	196
Basic shares	86.5		101.2		89.5		102.1
Dilutive securities:
Options and restricted stock awards	0.5		0.7		0.7		0.9
Diluted shares	87.0		101.9		90.2		103.0
Diluted EPS	$	2.10	$	1.39	$	1.42	$	1.90
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.6		0.1		1.2		—

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share 

	Second Quarter				Six Months
	2020		2019		2020		2019
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	183	$	142	$	128	$	196
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—		—		—		—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	183	$	142	$	128	$	196
Basic shares	86.5		101.2		89.5		102.1
Basic EPS	$	2.11	$	1.40	$	1.43	$	1.92
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	183	$	142	$	128	$	196
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	$	183	$	142	$	128	$	196
Basic shares	86.5		101.2		89.5		102.1
Dilutive securities:
Options and restricted stock awards	0.5		0.7		0.7		0.9
Diluted shares	87.0		101.9		90.2		103.0
Diluted EPS	$	2.10	$	1.39	$	1.42	$	1.90
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.6		0.1		1.2		—