Earnings Per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per Share

Basic earnings per share were computed by dividing net income available to common shareholders by the weighted average number of shares of common stock outstanding during each year. Shares issued or reacquired during the year, if applicable, were weighted for the portion of the year that they were outstanding. Diluted earnings per share give effect to potentially dilutive securities, including convertible preferred stock, employee stock options/SARs, restricted stock and convertible debt and equity compensation awards.

The following table sets forth the computation of basic and diluted net income per common share for the years ending December 31 (in millions, except per share data):

	2012		2011		2010
Numerator:
Net income	$	137.3	$	110.8	$	80.8
Numerator for basic earnings per share — income available to common shareholders	$	137.3	$	110.8	$	80.8
Effect of dilutive securities:
After-tax interest expense on convertible securities	—		—		0.2
Numerator for diluted earnings per share — income available to common shareholders	$	137.3	$	110.8	$	81.0
Denominator:
Denominator for basic earnings per share — weighted average shares	46.8		46.4		46.1
Effect of dilutive securities:
Equity compensation plans	0.7		0.7		0.5
Convertible preferred stock	0.1		0.1		0.1
Convertible securities	—		—		0.3
Denominator for diluted earnings per share — adjusted weighted average and assumed conversion	47.6		47.2		47.0
Basic earnings per share	$	2.93	$	2.39	$	1.75
Diluted earnings per share	$	2.88	$	2.35	$	1.72