Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Computation Of Basic And Diluted Net Income Per Share

The following table presents the computation of basic and diluted net income per share (in millions, except per share amounts):

	Years Ended December 31,
	2012		2011		2010
Net income	$	656.6	$	495.1	$	381.8
Basic:
Weighted-average shares outstanding		39.8		39.2		39.2
Basic net income per share	$	16.50	$	12.63	$	9.74
Diluted:
Weighted-average shares outstanding used in basic calculation		39.8		39.2		39.2
Add: Dilutive potential shares		1.3		1.0		1.1
Weighted-average shares used in computing diluted net income per share		41.1		40.2		40.3
Diluted net income per share	$	15.98	$	12.32	$	9.47