Earnings Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Computation of Earnings Per Share

	Third Quarter				Nine Months
	2013		2012		2013		2012
	(in millions, except per share amounts)
Basic earnings per share ("EPS"):
Net income (loss) attributable to AGL	$	384	$	142	$	459	$	36
Less: Distributed and undistributed income (loss) available to nonvested shareholders	0		—		0		1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	384	$	142	$	459	$	35
Basic shares	182.9		194.0		188.2		187.6
Basic EPS	$	2.10	$	0.73	$	2.44	$	0.19
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	384	$	142	$	459	$	35
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries	0		—		0		—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted	$	384	$	142	$	459	$	35
Basic shares	182.9		194.0		188.2		187.6
Effect of dilutive securities:
Options and restricted stock awards	1.0		0.7		0.9		0.7
Equity units	—		—		—		1.0
Diluted shares	183.9		194.7		189.1		189.3
Diluted EPS	$	2.09	$	0.73	$	2.43	$	0.19
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	1.9		3.9		3.0		11.9