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Net Income Per Share , Calculation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Line Items]
Net income	$ 104.0	$ 58.8
Basic shares:
Weighted-average common shares outstanding-basic (in shares)	170.6	170.2
Diluted shares:
Weighted-average common shares outstanding-basic (in shares)	170.6	170.2
Effect of potentially dilutive securities:
Weighted-average shares used to compute diluted net income per share (in shares)	174.2	174.8
Basic (in dollars per share)	$ 0.61	$ 0.35
Diluted (in dollars per share)	$ 0.60	$ 0.34
Restricted Stock Units (RSUs) [Member]
Effect of potentially dilutive securities:
RSUs, stock options, and ESPP (in shares)	2.4	3.3
Stock Options [Member]
Effect of potentially dilutive securities:
RSUs, stock options, and ESPP (in shares)	1.2	1.3

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