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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Percent of borrowings with fixed rate interest     98.00%   98.00%
Total exposure to floating rate interest rates 2.00%   2.00%    
Foreign Exchange Contract          
Derivative [Line Items]          
Notional amount $ 417,000,000   $ 417,000,000    
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments (13,900,000) $ 35,100,000 (7,100,000) $ 57,000,000.0  
Foreign Exchange Contract | Cash Flow Hedging          
Derivative [Line Items]          
Notional amount $ 0   $ 0