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Derivatives - Interest Rate Swaps (Details) - Derivatives Designated as Hedging Instruments
$ in Millions
Mar. 31, 2020
USD ($)
Interest Rate Swaps  
Notional Disclosures  
Notional amount of interest rate swaps $ 400
May 2020  
Notional Disclosures  
Notional amount of interest rate swaps 100
March 2022  
Notional Disclosures  
Notional amount of interest rate swaps $ 300