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BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |  |  |  |
Employee contribution limit per calendar year (as a percent of pre-tax earnings, up to statutory limit) |  | 50.00% |  |  |
Employer contribution per dollar employee contributes up to contribution limit (as a percent) |  |  |  |  | 100.00%
Employer contribution limit per calendar year (as a percent of compensation, up to statutory limit) | 3.00% |  |  |  | 10.00%
United States |  |  |  |  |
Defined Contribution Plan Disclosure |  |  |  |  |
Employer matching contributions during period |  | $ 8.6 | $ 5.8 | $ 2.8 |
Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure |  |  |  |  |
Employer matching contributions during period |  | $ 3.8 | $ 3.1 | $ 2.8 |

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