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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense (benefit) |  | $ 0.3 | $ 43.4 | $ 51.4 | $ 87.0 |
Income tax expense, percentage of pre-tax income |  | 0.10% | 12.90% | 4.80% | 9.40% |
Effective of change in tax rate | $ 51.3 |  |  |  |  |
Effective of change in tax rate (percent) |  | 12.90% |  | 4.80% |  |
Total gross unrecognized tax benefits |  | $ 86.2 |  | $ 86.2 |  | $ 78.8

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