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Note 14 - Noncontrolling Interests - Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated seeded investment products $ 365.0 $ 317.2 $ 233.9 $ 148.5
Consolidated Entity, Excluding VIE [Member]        
Consolidated seeded investment products $ 365.0 $ 317.2