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Note 10 - Fair Value Measurements - Level of Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Total investment securities $ 337.1 $ 334.2
Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 502.1 382.4
Fair Value, Recurring [Member]    
Cash equivalents 821.7 894.4
Total investment securities 839.2 716.6
Other 12.7  
Total assets 1,673.6 1,620.5
Long-term debt 383.3 [1] 298.0 [2]
Contingent consideration 30.4  
Other 13.6 20.3
Total liabilities 543.0 435.9
Other 13.6 20.3
Fair Value, Recurring [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   9.5
Fair Value, Recurring [Member] | Deferred Bonuses Hedge [Member]    
Derivative liabilities 115.7 117.6
Fair Value, Recurring [Member] | Other Investment Securities [Member]    
Total investment securities 337.1 334.2
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 502.1 382.4
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents 821.7 894.4
Total investment securities 534.4 529.8
Other 0.0  
Total assets 1,356.1 1,424.2
Long-term debt 0.0 [1] 0.0 [2]
Contingent consideration 0.0  
Other 1.9 1.7
Total liabilities 1.9 1.7
Other 1.9 1.7
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] | Deferred Bonuses Hedge [Member]    
Derivative liabilities 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investment Securities [Member]    
Total investment securities 273.8 212.2
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 260.6 317.6
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash equivalents 0.0 0.0
Total investment securities 275.2 186.7
Other 10.2  
Total assets 285.4 195.2
Long-term debt 383.3 [1] 298.0 [2]
Contingent consideration 0.0  
Other 11.7 18.6
Total liabilities 395.0 316.6
Other 11.7 18.6
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   8.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Bonuses Hedge [Member]    
Derivative liabilities 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investment Securities [Member]    
Total investment securities 33.7 122.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 241.5 64.7
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash equivalents 0.0 0.0
Total investment securities 2.0 0.1
Other 2.5  
Total assets 4.5 1.1
Long-term debt 0.0 [1] 0.0 [2]
Contingent consideration 30.4  
Other 0.0 0.0
Total liabilities 146.1 117.6
Other 0.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivatives Used in Consolidated Seeded Investment Products [Member]    
Other   1.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Deferred Bonuses Hedge [Member]    
Derivative liabilities 115.7 117.6
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investment Securities [Member]    
Total investment securities 2.0 0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Total investment securities 0.0 $ 0.1
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Cash equivalents [3] 0.0  
Total investment securities 27.6  
Other 0.0  
Total assets 27.6  
Long-term debt [1] 0.0  
Contingent consideration 0.0  
Other 0.0  
Total liabilities 0.0  
Other 0.0  
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Deferred Bonuses Hedge [Member]    
Derivative liabilities 0.0  
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Other Investment Securities [Member]    
Total investment securities 27.6  
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  
[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 NAV as a practical expedient and have not been categorized in the fair value hierarchy.