Note 4 - Investments (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Investment [Table Text Block]

		*June 30,*				*December 31,*
		*2025*				*2024*
Current investments:
Seeded investment products:
Consolidated VIEs		$	1,059.4			$	502.1
Consolidated VREs			148.1				132.5
Unconsolidated VIEs and VREs			91.5				127.1
Separately managed accounts			41.6				41.9
Total seeded investment products			1,340.6				803.6
Investments related to deferred compensation plans			39.2				29.8
Other investments			60.3				5.8
Total current investments		$	1,440.1			$	839.2
Non-current investments:
Equity method investments			18.9				23.1
Other non-current investments			8.9				—
Total investments		$	1,467.9			$	862.3

Gain (Loss) on Securities [Table Text Block]

		*Three months ended*								*Six months ended*
		*June 30,*								*June 30,*
		*2025*				*2024*				*2025*				*2024*
Seeded investment products and seed hedges, net		$	13.8			$	4.6			$	19.6			$	16.5
Third-party ownership interests in seeded investment products			36.7				3.8				33.4				14.3
Equity method investments			(1.6	)			(2.1	)			(3.3	)			(3.5	)
Other			3.7				0.1				(2.6	)			1.6
Investment gains, net		$	52.6			$	6.4			$	47.1			$	28.9

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

		*Six months ended June 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		$	(348.1	)		$	40.4			$	(307.7	)		$	(103.5	)		$	39.4				(64.1	)
Investments			(267.8	)			101.4				(166.4	)			(114.8	)			72.6				(42.2	)