Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):

	Three Months Ended March 31,
	2014		2013
Numerator:
Net income	$	110.6	$	91.0
Denominator:
Weighted-average shares used to compute   basic net income per share	486.2		504.7
Dilutive effect of employee stock awards	10.3		8.0
Weighted-average shares used to compute   diluted net income per share	496.5		512.7
Net income per share:
Basic	$	0.23	$	0.18
Diluted	$	0.22	$	0.18
Anti-dilutive:
Potential anti-dilutive shares	25.4		24.7