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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
INCOME TAXES |  |
Effective tax rate (as a percent) | 6.90% | 26.70%
Discrete tax benefit adjustment | $ 1.2 | $ 22.8
Discrete adjustments related to share based compensation in effective tax rate | $ 1.2 | $ 1.6

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