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Note 7 - Goodwill and Intangible Assets - Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Intangible assets, amortization $ (9.3) $ (0.3)
Accumulated amortization, balance (62.8) (62.1)
Foreign currency translation, accumulated amortization (3.9) (2.3)
Accumulated amortization, balance (76.0) (64.7)
Net intangible assets, balance 2,473.3 2,431.3
Net intangible assets 41.1 0.0
Foreign currency translation, Net intangible assets 25.9 17.3
Net intangible assets, balance 2,531.0 2,448.3
Goodwill, balance 1,550.4 1,290.3
Goodwill, addition 17.9 24.8
Foreign currency translation, Goodwill 53.2 36.4
Goodwill, balance 1,621.5 1,351.5
Client Relationships [Member]    
Balance 86.1 68.6
Intangible assets, amortization 0.0 0.0
Additions 0.0 0.0
Foreign currency translation, definite-lived intangible assets 4.3 2.3
Balance 90.4 70.9
Investment Management Agreements [Member]    
Balance 28.0  
Additions 41.1  
Foreign currency translation, definite-lived intangible assets 0.0  
Balance 69.1  
Definite Lived Trademarks [Member]    
Balance 5.5  
Additions 0.0  
Foreign currency translation, definite-lived intangible assets 0.0  
Balance 5.5  
Investment Management Agreements [Member]    
Balance 2,056.5 2,064.8
Foreign currency translation, indefinite-lived intangible assets 25.5 17.3
Balance 2,082.0 2,082.1
Trademarks [Member]    
Balance 360.0 360.0
Foreign currency translation, indefinite-lived intangible assets 0.0 0.0
Balance $ 360.0 $ 360.0