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Note 8 - Goodwill and Intangible Assets (Tables) | 12 Months Ended
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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 |

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