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Note 6 - Fair Value Measurements - Level of Fair Value (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Total investment securities $ 395.9 $ 337.1
Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 1,067.5 502.1
Fair Value, Recurring [Member]    
Cash equivalents 657.3 821.7
Total investment securities 1,463.4 839.2
Other 5.1  
Total assets 2,125.8 1,673.6
Seed hedge derivatives 25.7  
Long-term debt 404.8 [1] 383.3 [2]
Contingent consideration 24.5 30.4
Total liabilities 583.9 543.0
Other   5.1
Fair Value, Recurring [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   12.7
Fair Value, Recurring [Member] | Seed Hedge Derivatives [Member]    
Seed hedge derivatives 10.3 8.5
Fair Value, Recurring [Member] | Deferred Bonuses Hedge [Member]    
Seed hedge derivatives 92.6 115.7
Fair Value, Recurring [Member] | Warrants Liability [Member]    
Warrants 26.0  
Fair Value, Recurring [Member] | Other Investment Securities [Member]    
Total investment securities 395.9 337.1
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 1,067.5 502.1
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents 657.3 821.7
Total investment securities 838.2 534.4
Other 0.0  
Total assets 1,495.5 1,356.1
Seed hedge derivatives 4.6  
Long-term debt 0.0 [1] 0.0 [2]
Contingent consideration 0.0 0.0
Total liabilities 4.6 1.9
Other   1.9
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Seed Hedge Derivatives [Member]    
Seed hedge derivatives 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Bonuses Hedge [Member]    
Seed hedge derivatives 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Warrants Liability [Member]    
Warrants 0.0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investment Securities [Member]    
Total investment securities 322.4 273.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 515.8 260.6
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash equivalents 0.0 0.0
Total investment securities 576.2 275.2
Other 2.3  
Total assets 578.5 285.4
Seed hedge derivatives 2.5  
Long-term debt 404.8 [1] 383.3 [2]
Contingent consideration 0.0 0.0
Total liabilities 443.6 395.0
Other   3.2
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   10.2
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Seed Hedge Derivatives [Member]    
Seed hedge derivatives 10.3 8.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Bonuses Hedge [Member]    
Seed hedge derivatives 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Warrants Liability [Member]    
Warrants 26.0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investment Securities [Member]    
Total investment securities 24.5 33.7
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 551.7 241.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash equivalents 0.0 0.0
Total investment securities 28.6 2.0
Other 2.8  
Total assets 31.4 4.5
Seed hedge derivatives 18.6  
Long-term debt 0.0 [1] 0.0 [2]
Contingent consideration 24.5 30.4
Total liabilities 135.7 146.1
Other   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   2.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Seed Hedge Derivatives [Member]    
Seed hedge derivatives 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Deferred Bonuses Hedge [Member]    
Seed hedge derivatives 92.6 115.7
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants Liability [Member]    
Warrants 0.0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investment Securities [Member]    
Total investment securities 28.6 2.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 0.0 0.0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Cash equivalents 0.0 [3] 0.0 [4]
Total investment securities 20.4 [3] 27.6 [4]
Other [3] 0.0  
Total assets 20.4 [3] 27.6 [4]
Seed hedge derivatives [3] 0.0  
Long-term debt 0.0 [1],[3] 0.0 [2],[4]
Contingent consideration 0.0 [3] 0.0 [4]
Total liabilities 0.0 [3] 0.0 [4]
Other [4]   0.0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other [4]   0.0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Seed Hedge Derivatives [Member]    
Seed hedge derivatives 0.0 0.0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Deferred Bonuses Hedge [Member]    
Seed hedge derivatives 0.0 [3] 0.0 [4]
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Warrants Liability [Member]    
Warrants 0.0  
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Other Investment Securities [Member]    
Total investment securities 20.4 [3] 27.6 [4]
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities $ 0.0 [3] $ 0.0 [4]
[1] Carried at amortized cost in our Consolidated Balance Sheets and disclosed in this table at fair value.
[2] Carried at amortized cost in our Condensed Consolidated Balance Sheets and disclosed in this table at fair value.
[3] Certain seeded investment products that do not have a readily determinable fair value have been measured at fair value using the net asset value (“NAV”) as a practical expedient and have not been categorized in the fair value hierarchy.
[4] Certain seeded investment products that do not have a readily determinable fair value have been measured at fair value using the NAV as a practical expedient and have not been categorized in the fair value hierarchy.