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Derivatives - Undesignated Hedges (Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash Flow and Fair Value Hedges      
Foreign exchange losses on settlement assets and obligations, cash balances, and other assets and liabilities $ 2.6 $ 62.2 $ 56.1