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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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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