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Note 8 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Intangible Assets and Goodwill [Table Text Block]

​						​				​				Foreign
		December 31,												currency				December 31,
​		2023				Amortization				Additions				translation				2024
Indefinite-lived intangible assets:		​				​				​				​				​
Investment management agreements		$	2,064.8			$	—			$	—			$	(8.3	)		$	2,056.5
Trademarks			360.0				—				—				—				360.0
Definite-lived intangible assets:		​				​				​				​				​
Client relationships			68.6				—				20.5				(3.0	)			86.1
Investment management agreements			—				—				28.0				—				28.0
Trademarks			—				—				5.5				—				5.5
Accumulated amortization			(62.1	)			(3.1	)			—				2.4				(62.8	)
Net intangible assets		$	2,431.3			$	(3.1	)		$	54.0			$	(8.9	)		$	2,473.3
Goodwill		$	1,290.3			$	—			$	276.6			$	(16.5	)		$	1,550.4

​						​				​				Foreign
		December 31,												currency				December 31,
​		2022				Amortization				Disposal				translation				2023
Indefinite-lived intangible assets:		​				​				​				​				​
Investment management agreements		$	2,046.5			$	—			$	—			$	18.3			$	2,064.8
Trademarks			360.0				—				—				—				360.0
Definite-lived intangible assets:		​				​				​				​				​
Client relationships			68.9				—				(2.6	)			2.3				68.6
Accumulated amortization			(60.7	)			(1.7	)			2.6				(2.3	)			(62.1	)
Net intangible assets		$	2,414.7			$	(1.7	)		$	—			$	18.3			$	2,431.3
Goodwill		$	1,253.1			$	—			$	—			$	37.2			$	1,290.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Future amortization:		Amount
2025		$	11.1
2026			11.1
2027			11.1
2028			8.9
2029			2.6
Thereafter			12.0
Total		$	56.8

X

- Definition

Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/350-30/tableOfContent

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/350-20/tableOfContent

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

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