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Derivative Instruments and Hedging Activities - Narrative (Details)
Jun. 30, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Foreign currency cash flow gain to be reclassified during next 12 months $ 17,900,000
Termination value of outstanding derivatives in a liability position 5,200,000
Collateral already posted, aggregate fair value $ 0