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Note 6 - Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

​		Notional value
​		December 31, 2024				December 31, 2023
Futures and contracts for difference		$	789.0			$	1,018.0
Credit default swaps			148.5				199.7
Total return swaps			69.7				51.8
Foreign currency forward contracts			328.2				176.2

​		Notional value
​		December 31, 2024				December 31, 2023
Futures and contracts for difference		$	160.5			$	1,555.1
Credit default swaps			4.3				13.2
Total return swaps			10.3				0.3
Interest rate swaps			13.9				2.2
Foreign currency forward contracts			196.6				135.3
Other			—				0.3

​		Notional value
​		December 31, 2024				December 31, 2023
Foreign currency forward contracts and swaps		$	38.4			$	65.3

Derivative Instruments, Gain (Loss) [Table Text Block]

​		Year ended December 31,
​		2024				2023				2022
Futures and contracts for difference		$	(10.5	)		$	(7.0	)		$	40.8
Credit default swaps			(3.0	)			(6.5	)			3.7
Total return swaps			(9.3	)			(12.8	)			21.3
Foreign currency forward contracts			6.4				8.4				(9.6	)
Total gains (losses) from derivative instruments		$	(16.4	)		$	(17.9	)		$	56.2

Schedule of Derivative Instruments [Table Text Block]

		Fair value
​		December 31, 2024				December 31, 2023
Derivative assets		$	8.8			$	1.8
Derivative liabilities			8.5				16.7

X

- Definition

Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

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