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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, 2018
Dec. 31, 2017
Foreign currency forward exchange contracts    
Derivative Financial Instruments    
Notional Amount $ 1,268.1 $ 979.8
Cross currency swap contracts    
Derivative Financial Instruments    
Notional Amount $ 300.0 $ 0.0