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FINANCIAL INSTRUMENTS - Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign exchange gains/(losses) related to balance sheet re-measurement $ 5.9 $ (3.8) $ (1.1) $ (3.5)
Forward contracts | Other income | Derivatives Not Designated as Hedging Instruments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Recognized gains/(losses) in interest and other income, net $ (5.0) $ 4.2 $ (3.2) $ 5.7