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Note 10 - Noncontrolling Interests (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Redeemable Noncontrolling Interest [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Consolidated seeded investment products |  | $ | 771.3 |  |  | $ | 365.0 |
Noncontrolling Interest Increase (Decrease) [Table Text Block] |
|  | Three months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Opening balance |  | $ | 744.7 |  |  | $ | 346.7 |  |  | $ | 365.0 |  |  | $ | 317.2 |
Changes in market value |  |  | 39.0 |  |  |  | 22.7 |  |  |  | 72.4 |  |  |  | 37.0 |
Changes in ownership |  |  | 11.9 |  |  |  | 116.9 |  |  |  | 324.5 |  |  |  | 132.8 |
Foreign currency translation |  |  | (24.3 | ) |  |  | 7.2 |  |  |  | 9.4 |  |  |  | 6.5 |
Closing balance |  | $ | 771.3 |  |  | $ | 493.5 |  |  | $ | 771.3 |  |  | $ | 493.5 |
Nonredeemable Noncontrolling Interests [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Nonredeemable noncontrolling interests in: |  |  |  |  |  |  |  |
VPC |  | $ | 121.0 |  |  | $ | 126.5 |
TCM |  |  | 10.0 |  |  |  | — |
Other |  |  | — |  |  |  | 0.1 |
Total nonredeemable noncontrolling interests |  | $ | 131.0 |  |  | $ | 126.6 |

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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3A -Subparagraph (24) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A + Details
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