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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Trading revenue	$ 76.2	$ (488.6)	$ (160.3)
Total (Loss) gain realized in income on derivatives	(78.7)	(460.1)	(39.2)
Total Unrealized gain (loss) recognized in income on derivatives	154.9	(28.5)	(121.1)
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Trading revenue	(1.9)	(8.4)	(5.7)
Total (Loss) gain realized in income on derivatives	(9.3)	(6.1)	1.8
Total Unrealized gain (loss) recognized in income on derivatives	7.4	(2.3)	(7.5)
Derivative contracts related to forecasted sales
Derivative Instruments, Gain (Loss) [Line Items]
Trading revenue	78.1	(490.9)	(160.7)
Total (Loss) gain realized in income on derivatives	(80.9)	(455.1)	(45.6)
Total Unrealized gain (loss) recognized in income on derivatives	159.0	(35.8)	(115.1)
Financial trading contracts
Derivative Instruments, Gain (Loss) [Line Items]
Trading revenue	0.0	10.7	6.1
Total (Loss) gain realized in income on derivatives	11.5	1.1	4.6
Total Unrealized gain (loss) recognized in income on derivatives	$ (11.5)	$ 9.6	$ 1.5

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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.

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