Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Computation of Earnings Per Share

	Third Quarter				Nine Months
	2018		2017		2018		2017
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	161	$	208	$	433	$	678
Less: Distributed and undistributed income (loss) available to nonvested shareholders	1		0		1		1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	160	$	208	$	432	$	677
Basic shares	108.0		118.7		111.6		121.8
Basic EPS	$	1.48	$	1.75	$	3.87	$	5.56
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	160	$	208	$	432	$	677
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries	0		0		0		0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted	$	160	$	208	$	432	$	677
Basic shares	108.0		118.7		111.6		121.8
Dilutive securities:
Options and restricted stock awards	1.3		2.0		1.3		1.7
Diluted shares	109.3		120.7		112.9		123.5
Diluted EPS	$	1.47	$	1.72	$	3.83	$	5.48
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.0		—		0.1		0.1