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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

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- Definition Amount classified as intangible assets, net of amortization, excluding goodwill, attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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