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Note 10 - Fair Value Measurements - Changes in Level 3 Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Beginning of period fair value $ 1.1 $ 18.3
Settlement of contingent consideration 0.0 (0.2)
Fair value adjustments 1.4 (12.1)
Transfers from (to) Level 1, net 0.0 (4.6)
Purchases (sales) of securities, net 2.0 (0.3)
End of period fair value $ 4.5 $ 1.1