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Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grant-date fair value of stock options vested | $ 0.8 | $ 0.6
Aggregate intrinsic value of stock options exercised | $ 179.1 | $ 1.2
Stock options granted (in shares) | 1,130,000 | 0
Unrecognized share-based compensation expense | $ 623.0 |
Weighted-average recognition period for unrecognized share-based compensation expense | 3 years 1 month 6 days |
2009 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for issuance (in shares) | 0 |
2009 Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 10 years |
2009 Plan | RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 7 years |
2019 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of outstanding shares, additional reserve | 5.00% |
2019 Plan | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for issuance (in shares) | 117,448,816 |
2019 Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 10 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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