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Derivatives and Fair Value Measurements - Pre-Tax Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue | $ 3.3 | $ (12.7) | $ 76.2
Total (Loss) gain realized in income on derivatives | (2.7) | (3.7) | (78.7)
Total Unrealized gain (loss) recognized in income on derivatives | 6.0 | (9.0) | 154.9
Foreign currency option contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue | 3.3 | (12.7) | (1.9)
Total (Loss) gain realized in income on derivatives | (2.7) | (3.7) | (9.3)
Total Unrealized gain (loss) recognized in income on derivatives | $ 6.0 | $ (9.0) | 7.4
Derivative contracts related to forecasted sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue |  |  | 78.1
Total (Loss) gain realized in income on derivatives |  |  | (80.9)
Total Unrealized gain (loss) recognized in income on derivatives |  |  | 159.0
Financial trading contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue |  |  | 0.0
Total (Loss) gain realized in income on derivatives |  |  | 11.5
Total Unrealized gain (loss) recognized in income on derivatives |  |  | $ (11.5)

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