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Note 7 - Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Foreign |  |  |  |  |
|  | December 31, |  |  |  |  |  |  |  |  |  |  | currency |  |  | March 31, |
|  | 2024 |  |  | Amortization |  |  | Additions |  |  | translation |  |  | 2025 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment management agreements |  | $ | 2,056.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.8 |  |  | $ | 2,066.3 |
Trademarks |  |  | 360.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 360.0 |
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Client relationships |  |  | 86.1 |  |  |  | — |  |  |  | — |  |  |  | 1.3 |  |  |  | 87.4 |
Investment management agreements |  |  | 28.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28.0 |
Trademarks |  |  | 5.5 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5.5 |
Accumulated amortization |  |  | (62.8 | ) |  |  | (2.8 | ) |  |  | — |  |  |  | (1.2 | ) |  |  | (66.8 | )
Net intangible assets |  | $ | 2,473.3 |  |  | $ | (2.8 | ) |  | $ | — |  |  | $ | 9.9 |  |  | $ | 2,480.4 |
Goodwill |  | $ | 1,550.4 |  |  | $ | — |  |  | $ | 16.0 |  |  | $ | 20.8 |  |  | $ | 1,587.2 |
|  |  |  |  |  |  |  |  |  | Foreign |  |  |  |  |
|  | December 31, |  |  |  |  |  |  | currency |  |  | March 31, |
|  | 2023 |  |  | Amortization |  |  | translation |  |  | 2024 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment management agreements |  | $ | 2,064.8 |  |  | $ | — |  |  | $ | (4.2 | ) |  | $ | 2,060.6 |
Trademarks |  |  | 360.0 |  |  |  | — |  |  |  | — |  |  |  | 360.0 |
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Client relationships |  |  | 68.6 |  |  |  | — |  |  |  | (1.3 | ) |  |  | 67.3 |
Accumulated amortization |  |  | (62.1 | ) |  |  | (0.1 | ) |  |  | 1.0 |  |  |  | (61.2 | )
Net intangible assets |  | $ | 2,431.3 |  |  | $ | (0.1 | ) |  | $ | (4.5 | ) |  | $ | 2,426.7 |
Goodwill |  | $ | 1,290.3 |  |  | $ | — |  |  | $ | (8.1 | ) |  | $ | 1,282.2 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Future amortization |  | Amount |
2025 (remainder of year) |  | $ | 8.3 |
2026 |  |  | 11.1 |
2027 |  |  | 11.1 |
2028 |  |  | 8.9 |
2029 |  |  | 2.6 |
Thereafter |  |  | 12.1 |
Total |  | $ | 54.1 |

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