Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows (in millions, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30, 2020		September 30, 2019		September 30, 2020		September 30, 2019
Numerator:
Net income	$	123.4	$	80.2	$	341.8	$	213.5
Denominator:
Basic shares:
Weighted-average common stock outstanding-basic	162.1		171.3		164.8		170.9
Diluted shares:
Weighted-average common stock outstanding-basic	162.1		171.3		164.8		170.9
Effect of potentially dilutive securities:
RSUs	2.3		2.4		2.4		2.9
Stock options	1.2		1.1		1.2		1.1
Weighted-average shares used to compute diluted net income per share	165.6		174.8		168.4		174.9
Net income per share:
Basic	$	0.76	$	0.47	$	2.07	$	1.25
Diluted	$	0.75	$	0.46	$	2.03	$	1.22

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following weighted-average shares of common stock were excluded from the computation of diluted net income per share for the periods presented, as their effect would have been antidilutive (in millions):

	Three Months Ended		Nine Months Ended
	September 30, 2020	September 30, 2019	September 30, 2020	September 30, 2019
RSUs	0.3	0.2	0.3	0.3
Stock options	0.6	0.7	0.5	0.6
Total	0.9	0.9	0.8	0.9