Earnings Per Common Share

12 Months Ended

Dec. 31, 2011

Earnings Per Common Share

Earnings Per Common Share

18. Earnings Per Common Share

        The computations of the basic and diluted per share amounts were as follows:

	For the year ended December 31,
	2011		2010		2009
	(in millions, except per share data)
Net income	$	751.2	$	717.2	$	645.7
Subtract:
Net income attributable to noncontrolling interest		36.2		17.9		23.0
Preferred stock dividends		33.0		33.0		33.0
Net income available to common stockholders	$	682.0	$	666.3	$	589.7
Weighted-average shares outstanding:
Basic		314.5		320.3		297.3
Dilutive effects:
Stock options		1.2		0.9		0.4
Performance share awards		0.4		0.3		—
Restricted stock units		1.5		1.5		1.2
Diluted		317.6		323.0		298.9
Net income per common share:
Basic	$	2.17	$	2.08	$	1.98
Diluted	$	2.15	$	2.06	$	1.97

        The calculation of diluted earnings per share for the years ended December 31, 2011, 2010 and 2009, excludes the incremental effect related to certain outstanding stock-based compensation grants due to their anti-dilutive effect.