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Derivative Financial Instruments - Counterparty Credit Risk and Credit-Risk Related Contingent Features (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative contracts      
Counterparty credit risk adjustments $ 0.1 $ 0.2 $ 0.1
Credit-risk-related contingent features      
Aggregate fair value of derivative instruments in a net liability position 0.0 26.9  
Collateral posted for derivatives in a net liability position 0.0 $ 19.8  
Interest rate swaps      
Derivative contracts      
Collateral thresholds for derivative agreements with credit risk related contingent features $ 0.3