Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share

Schedule of computation of basic and diluted EPS

		Second Quarter					Six Months
		2011			2010		2011		2010
		(in millions, except per share amounts)
Basic earnings per share:
Net income (loss)		$	(57.7	)	$	203.5	$	67.7	$	525.5
Less: Distributed and undistributed income (loss) available to nonvested shareholders			—			0.2		0.1		0.7
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries		$	(57.7	)	$	203.3	$	67.6	$	524.8
Basic shares			184.2			184.1		184.0		184.2
Basic earnings per share		$	(0.31	)	$	1.10	$	0.37	$	2.85
Diluted earnings per share:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries		$	(57.7	)	$	203.3	$	67.6	$	524.8
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		$	(57.7	)	$	203.3	$	67.6	$	524.8
Basic shares			184.2			184.1		184.0		184.2
Effect of dilutive securities:
	Options and restricted stock awards		—			0.8		0.9		0.9
	Equity units		—			3.9		2.5		4.7
Diluted shares			184.2			188.8		187.4	$	189.8
Diluted earnings per share		$	(0.31	)	$	1.08	$	0.36	$	2.77
Potentially dilutive securities excluded from computation of earnings per share because of antidilutive effect			9.6			2.7		2.9		2.4