Net Income Per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Net Income Per Share

Net Income Per Share

The following table reconciles net income and shares used in the calculation of basic net income per share to those used for diluted net income per share:

($ and shares in millions)	2012		2011		2010
Net income, as reported, for basic net income per share	$	80.7	$	75.5	$	65.3
Plus: interest expense on convertible debt, net of tax	2.0		4.3		4.3
Net income for diluted net income per share	$	82.7	$	79.8	$	69.6
Weighted average common shares outstanding	34.0		33.7		33.3
Assumed stock options exercised and awards vested, based on the treasury stock method	0.6		0.4		0.5
Assumed conversion of convertible debt, based on the if-converted method	1.3		2.9		2.9
Weighted average shares assuming dilution	35.9		37.0		36.7

Options outstanding but not included in the computation of diluted net income per share because their impact was antidilutive were 0.5 million, 1.6 million and 1.1 million for fiscal years 2012, 2011 and 2010, respectively.