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Derivative Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Expected contract term 10 years  
Maximum exposure $ 0.3  
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of collateral $ 2.7 $ 14.3