Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of basic and diluted net income per share

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Numerator:
Net income	$	223.8	$	165.7	$	374.7	$	454.3
Denominator:
Weighted-average shares used to compute basic net income per share	346.2		378.3		350.1		380.0
Dilutive effect of employee stock awards	4.3		4.4		5.1		6.5
Weighted-average shares used to compute diluted net income per share	350.5		382.7		355.2		386.5
Net income per share
Basic	$	0.65	$	0.44	$	1.07	$	1.20
Diluted	$	0.64	$	0.43	$	1.05	$	1.18
Anti-dilutive shares	4.2		1.0		5.0		1.2