Earnings Per Share

12 Months Ended

Dec. 31, 2012

25. Earnings Per Share

The calculation of basic earnings per share is based on the weighted average number of shares of the Company's common stock outstanding during the period. Diluted earnings per share is similar to basic earnings per share, but adjusts for the dilutive effect of the potential issuance of incremental shares of the Company's common stock. The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share available to common stockholders.

	For the Years Ended December 31,

	2010		2011		2012
Numerator
Net income (controlling interest)	$	138.6	$	164.9	$	174.0
Interest expense on convertible securities, net of taxes		0.1		—		—

Net income (controlling interest), as adjusted	$	138.7	$	164.9	$	174.0

Denominator
Average shares outstanding—basic		47.4		51.8		51.7
Effect of dilutive instruments:
Stock options and other awards		1.0		1.2		1.3
Forward sale		0.6		—		—
Senior convertible securities		0.4		—		—

Average shares outstanding—diluted		49.4		53.0		53.0

As more fully discussed in Notes 10 and 12, the Company had convertible securities outstanding during the periods presented and is required to apply the if-converted method to these securities in its calculation of diluted earnings per share. Under the if-converted method, shares that are issuable upon conversion are deemed outstanding, regardless of whether the securities are contractually convertible into the Company's common stock at that time. For this calculation, the interest expense (net of tax) attributable to these dilutive securities is added back to Net income (controlling interest), reflecting the assumption that the securities have been converted. Issuable shares for these securities and related interest expense are excluded from the calculation if an assumed conversion would be anti-dilutive to diluted earnings per share.

The Company did not repurchase any shares of common stock during the years ended December 31, 2010. For the twelve months ended December 31, 2011 and 2012, the Company repurchased approximately 0.7 million and 0.6 million shares of common stock under the share repurchase programs approved by the Company's Board of Directors.

The diluted earnings per share calculations in the table above exclude the anti-dilutive effect of the following shares:

	For the Years Ended December 31,

	2010		2011		2012
Stock options and other awards		1.3		1.2		0.7
Senior convertible securities		3.6		3.6		3.6
Junior convertible trust preferred securities		4.2		4.2		4.2
Forward equity sales		—		—		0.2

As discussed further in Note 19, the Company may settle portions of its Affiliate equity purchases in shares of its common stock. Because it is the Company's intent to settle these potential repurchases in cash, the calculation of diluted earnings per share excludes any potential dilutive effect from possible share settlements.

- Definition

The entire disclosure for earnings per share.

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