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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 22, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]          
Income tax expense (benefit)   $ 38.4 $ 0.3 $ 67.3 $ 51.4
Income tax expense, percentage of pre-tax income   10.80% 0.10% 8.70% 4.80%
Income Tax Contingency [Line Items]          
Increase in unrecognized tax benefits $ 36.8        
Increase in income tax expense $ 36.8        
Swiss          
Income Tax Contingency [Line Items]          
Re-measurement of deferred tax assets   $ 51.3   $ 51.3