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Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments for Fair Value Hedges (Parenthetical) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Amortized cost basis of closed portfolios used in hedging relationships $ 39.3
Cumulative basis adjustments associated with hedging relationships 0.2
Designated hedged items $ 20.0