Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share 

	Third Quarter				Nine Months
	2019		2018		2019		2018
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	69	$	161	$	265	$	433
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	$	69	$	160	$	265	$	432
Basic shares	98.2		108.0		100.8		111.6
Basic EPS	$	0.71	$	1.48	$	2.63	$	3.87
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	69	$	160	$	265	$	432
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	$	69	$	160	$	265	$	432
Basic shares	98.2		108.0		100.8		111.6
Dilutive securities:
Options and restricted stock awards	0.7		1.3		0.8		1.3
Diluted shares	98.9		109.3		101.6		112.9
Diluted EPS	$	0.70	$	1.47	$	2.61	$	3.83
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	—		—		—		0.1

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share 

	Third Quarter				Nine Months
	2019		2018		2019		2018
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	69	$	161	$	265	$	433
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	$	69	$	160	$	265	$	432
Basic shares	98.2		108.0		100.8		111.6
Basic EPS	$	0.71	$	1.48	$	2.63	$	3.87
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	69	$	160	$	265	$	432
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	$	69	$	160	$	265	$	432
Basic shares	98.2		108.0		100.8		111.6
Dilutive securities:
Options and restricted stock awards	0.7		1.3		0.8		1.3
Diluted shares	98.9		109.3		101.6		112.9
Diluted EPS	$	0.70	$	1.47	$	2.61	$	3.83
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	—		—		—		0.1