Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share 

	First Quarter
	2019		2018
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	54	$	197
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—		1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	54	$	196
Basic shares	103.0		115.2
Basic EPS	$	0.52	$	1.71
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	54	$	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	$	54	$	196
Basic shares	103.0		115.2
Dilutive securities:
Options and restricted stock awards	1.0		1.4
Diluted shares	104.0		116.6
Diluted EPS	$	0.52	$	1.68
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	—		0.2

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share 

	First Quarter
	2019		2018
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	54	$	197
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—		1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	54	$	196
Basic shares	103.0		115.2
Basic EPS	$	0.52	$	1.71
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	54	$	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	$	54	$	196
Basic shares	103.0		115.2
Dilutive securities:
Options and restricted stock awards	1.0		1.4
Diluted shares	104.0		116.6
Diluted EPS	$	0.52	$	1.68
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	—		0.2