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Derivatives - Undesignated Hedges (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flow and Fair Value Hedges    
Foreign exchange gains/(losses) on settlement assets and obligations, cash balances, and other assets and liabilities $ 12.2 $ (17.5)