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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
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue | $ (12.7) | $ 76.2 | $ (488.6)
Total (Loss) gain realized in income on derivatives | (3.7) | (78.7) | (460.1)
Total Unrealized gain (loss) recognized in income on derivatives | (9.0) | 154.9 | (28.5)
Foreign currency option contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue | (12.7) | (1.9) | (8.4)
Total (Loss) gain realized in income on derivatives | (3.7) | (9.3) | (6.1)
Total Unrealized gain (loss) recognized in income on derivatives | $ (9.0) | 7.4 | (2.3)
Derivative contracts related to forecasted sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue |  | 78.1 | (490.9)
Total (Loss) gain realized in income on derivatives |  | (80.9) | (455.1)
Total Unrealized gain (loss) recognized in income on derivatives |  | 159.0 | (35.8)
Financial trading contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Trading revenue |  | 0.0 | 10.7
Total (Loss) gain realized in income on derivatives |  | 11.5 | 1.1
Total Unrealized gain (loss) recognized in income on derivatives |  | $ (11.5) | $ 9.6

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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