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Note 4 - Investments (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Investment [Table Text Block]

		*September 30,*				*December 31,*
		*2025*				*2024*
Current investments:
Seeded investment products:
Consolidated VIEs		$	1,067.5			$	502.1
Consolidated VREs			157.8				132.5
Unconsolidated VIEs and VREs			149.8				127.1
Separately managed accounts			33.4				41.9
Total seeded investment products			1,408.5				803.6
Investments related to deferred compensation plans			47.8				29.8
Other investments			7.1				5.8
Total current investments		$	1,463.4			$	839.2
Non-current investments:
Equity method investments			17.8				23.1
Other non-current investments			8.8				—
Total investments		$	1,490.0			$	862.3

Gain (Loss) on Securities [Table Text Block]

		*Three months ended*								*Nine months ended*
		*September 30,*								*September 30,*
		*2025*				*2024*				*2025*				*2024*
Seeded investment products and seed hedges, net		$	8.3			$	10.8			$	27.9			$	27.3
Third-party ownership interests in seeded investment products			39.0				22.7				72.4				37.0
Equity method investments			(1.1	)			(1.0	)			(4.4	)			(4.5	)
Other			8.9				2.5				6.3				4.1
Investment gains, net		$	55.1			$	35.0			$	102.2			$	63.9

Cash Flows Related to Investment Securities and Other Assets [Table Text Block]

		*Nine months ended September 30,*
		*2025*												*2024*
		*Purchases*				*Sales,*								*Purchases*				*Sales,*
		*and*				*settlements and*				*Net*				*and*				*settlements and*				*Net*
		*settlements*				*maturities*				*cash flow*				*settlements*				*maturities*				*cash flow*
Investments by consolidated seeded investment products		$	(397.8	)		$	140.5			$	(257.3	)		$	(230.2	)		$	51.2				(179.0	)
Investments			(361.5	)			221.3				(140.2	)			(178.1	)			83.9				(94.2	)