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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Derivative Financial Instruments Used to Manage Currency Exchange Rate Risk and Interest Rate Risk (Details) - Derivatives designated as hedging instruments - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Foreign currency forward exchange contracts    
Derivative Financial Instruments    
Derivative notional amount $ 1,247.7 $ 1,378.2
Cross currency swap contracts    
Derivative Financial Instruments    
Derivative notional amount $ 300.0 $ 300.0