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Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Available-for-Sale Securities [Abstract]    
Fair value of securities pledged as collateral $ 76.6 $ 53.9
Securities delivered for repurchase agreements 22.5 17.8
Fair value investments $ 226.2 $ 235.5
Fair value as a percentage of available-for-sale investment portfolio 99.00% 100.00%
Unrealized loss on securities $ 41.6 $ 40.7