Net Income Per Share

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Net Income Per Share

Note 5:  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)	2013		2012		2011
Net income, as reported, for basic net income per share	$	112.3	$	80.7	$	75.5
Plus: interest expense on convertible debt, net of tax	—		2.0		4.3
Net income for diluted net income per share	$	112.3	$	82.7	$	79.8
Weighted average common shares outstanding	69.6		68.1		67.3
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method	1.7		1.1		0.9
Assumed conversion of convertible debt, based on the if-converted method	0.1		2.6		5.8
Weighted average shares assuming dilution	71.4		71.8		74.0

During 2013, the number of shares from stock-based compensation plans not included in the computation of diluted net income per share, because their impact was antidilutive, was immaterial. During 2012 and 2011, there were 1.0 million and 3.2 million antidilutive shares, respectively, excluded from the computation.