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Stockholders' Equity - Schedule of Stock Option and Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of shares available for issuance under the Plans
Beginning balance (in shares)	9.0	12.1	14.6
Reserved for issuance under the 2018 Plan (in shares)	41.4
Additional shares authorized (in shares)	1.3	6.7
Options and RSUs canceled (in shares)	6.0	6.2	14.1
Shares repurchased for tax withholdings on release of restricted stock (unaudited) (in shares)	15.6	5.5
Restricted stock granted (in shares)	(16.2)	(21.5)	(16.6)
Ending balance (in shares)	57.1	9.0	12.1	14.6
Options Outstanding, Number of shares outstanding under the Plans
Beginning balance (in shares)	5.0	5.4	13.4
Options canceled (in shares)	(0.3)	(0.3)	(8.0)
Options exercised (in shares)	(3.4)	(0.1)
Ending balance (in shares)	1.3	5.0	5.4	13.4
Vested during period (in shares)	1.3
Unvested at end of period (in shares)	0.0
Options Outstanding, Weighted- average exercise price per share
Beginning balance (in dollars per share)	$ 10.52	$ 10.68	$ 17.51
Options canceled (in dollars per share)	22.90	17.44	22.04
Options exercised (in dollars per share)	7.75	6.00
Ending balance (in dollars per share)	14.68	$ 10.52	$ 10.68	$ 17.51
Vested during period (in dollars per share)	14.68
Unvested at end of period (in dollars per shares)	$ 0.00
Options Outstanding, Weighted- average remaining contractual term (In years)
Weighted-average contractual term	5 years	5 years 6 months	6 years 6 months	8 years 1 month 6 days
Restricted Stock
Restricted Stock Outstanding, Number of Plan shares outstanding
Beginning balance (in shares)	54.9	54.0	43.5
RSUs canceled (in shares)	(5.7)	(6.0)	(6.1)
Restricted stock granted (in shares)	16.2	21.5	16.6
RSUs released (in shares)	(40.4)	(14.6)
Ending balance (in shares)	25.0	54.9	54.0	43.5
Vested (in shares)	0.0
Restricted Stock Outstanding, Weighted- average grant date fair value per share
Beginning balance (in dollars per share)	$ 15.60	$ 16.41	$ 17.67
RSUs released (in dollars per share)	15.42	17.12
RSUs canceled (in dollars per share)	16.78	17.96	20.06
Shares repurchased for tax withholdings on release of restricted stock (in dollars per share)	15.45	17.09
Restricted stock granted (in dollars per share)	20.26	15.70	15.59
Ending balance (in dollars per share)	18.68	$ 15.60	$ 16.41	$ 17.67
RSUs vested (in dollars per share)	$ 0.00
Restricted Stock Units (RSUs)
Restricted Stock Outstanding, Weighted- average grant date fair value per share
Fair value of RSUs	$ 913.5	$ 232.5	$ 77.2

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