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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | $ 2.3 | $ 25.7
Stock option expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, period of recognition | 6 years |
Restricted stock unit expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | $ 0.6 | 0.0
Unrecognized compensation cost | $ 8.6 |
Unrecognized compensation cost, period of recognition | 4 years |
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | $ 1.7 | 25.7
Unrecognized compensation cost | $ 7.6 |
Tender offer | Common stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense |  | $ 25.1
2020 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for issuance (in shares) | 30.0 |

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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=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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