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SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Apr. 30, 2021 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Giving Effect to Future Stock Split |  |  | 103,350,000 | 97,350,000
Options exercisable, number of shares | 9,500,000 |  |  |
Options exercisable, weighted-average exercise price (usd per share) | $ 94.76 |  |  |
Employee Stock Purchase Plan, number of shares purchased by employees | 500,000 | 500,000 |  |
2010 Incentive Award Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for issuance |  |  | 34,450,000 | 32,450,000
Number of shares reserved for future issuance | 25,500,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeited (in shares) | 300,000 |  |  |
Restricted Stock Units (RSUs) | 2010 Incentive Award Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares reserved for future issuance | 11,100,000 |  |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Stock Purchase Plan, value of shares purchased by employees | $ 75.9 | $ 71.2 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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