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Available for Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Available-for-Sale Securities [Abstract]
Fair value of securities pledged as collateral	$ 60.2	$ 53.9
Securities delivered for repurchase agreements	23.8	17.8
Fair value investments	$ 235.0	$ 235.5
Fair value as a percentage of available-for-sale investment portfolio	99.00%	100.00%
Unrealized loss on securities	$ 37.6	$ 40.7

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