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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Intangible assets, amortization $ (3.1) $ (1.7)
Accumulated amortization, balance (62.1) (60.7)
Foreign currency translation, accumulated amortization 2.4 (2.3)
Accumulated amortization, balance (62.8) (62.1)
Net intangible assets, balance 2,431.3 2,414.7
Net intangible assets 54.0  
Foreign currency translation, Net intangible assets (8.9) 18.3
Net intangible assets, balance 2,473.3 2,431.3
Goodwill, balance 1,290.3 1,253.1
Goodwill, addition 276.6 0.0
Foreign currency translation, Goodwill (16.5) 37.2
Goodwill, balance 1,550.4 1,290.3
Accumulated amortization, disposals   2.6
Net intangible assets, disposals   0.0
Client Relationships [Member]    
Balance 68.6 68.9
Intangible assets, amortization 0.0  
Additions 20.5  
Foreign currency translation, definite-lived intangible assets (3.0) 2.3
Balance 86.1 68.6
Intangible assets, disposals   (2.6)
Investment Management Agreements [Member]    
Balance 0.0  
Additions 28.0  
Foreign currency translation, definite-lived intangible assets 0.0  
Balance 28.0 0.0
Definite Lived Trademarks [Member]    
Balance 0.0  
Additions 5.5  
Foreign currency translation, definite-lived intangible assets 0.0  
Balance 5.5 0.0
Investment Management Agreements [Member]    
Balance 2,064.8 2,046.5
Foreign currency translation, indefinite-lived intangible assets (8.3) 18.3
Balance 2,056.5 2,064.8
Trademarks [Member]    
Balance 360.0 360.0
Foreign currency translation, indefinite-lived intangible assets 0.0 0.0
Balance $ 360.0 $ 360.0