Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share 

	First Quarter
	2020			2019
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	(55	)	$	54
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—			—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	(55	)	$	54
Basic shares	92.6			103.0
Basic EPS	$	(0.59	)	$	0.52
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	(55	)	$	54
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	$	(55	)	$	54
Basic shares	92.6			103.0
Dilutive securities:
Options and restricted stock awards	—			1.0
Diluted shares	92.6			104.0
Diluted EPS	$	(0.59	)	$	0.52
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	1.7			—

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share 

	First Quarter
	2020			2019
	(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$	(55	)	$	54
Less: Distributed and undistributed income (loss) available to nonvested shareholders	—			—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	(55	)	$	54
Basic shares	92.6			103.0
Basic EPS	$	(0.59	)	$	0.52
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	(55	)	$	54
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	$	(55	)	$	54
Basic shares	92.6			103.0
Dilutive securities:
Options and restricted stock awards	—			1.0
Diluted shares	92.6			104.0
Diluted EPS	$	(0.59	)	$	0.52
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	1.7			—