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Note 17 - Accumulated Other Comprehensive Loss - Schedule of Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Total other comprehensive loss, pre tax $ 67.2 $ 81.3 $ (274.7)
Total other comprehensive loss, tax 5.7 5.9 12.0
Total other comprehensive loss, net 72.9 87.2 (262.7)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Total other comprehensive loss, pre tax (55.1) 94.4 (224.2)
Total other comprehensive loss, tax 2.5 2.4 3.2
Total other comprehensive loss, net (52.6) 96.8 (221.0)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Total other comprehensive loss, pre tax (17.5) (18.7) (46.8)
Total other comprehensive loss, tax 3.2 3.5 8.8
Total other comprehensive loss, net (14.3) (15.2) (38.0)
Reclassification to Net Income [Member]      
Total other comprehensive loss, pre tax [1] 139.8 5.6 (3.7)
Total other comprehensive loss, tax [1] 0.0 0.0 0.0
Total other comprehensive loss, net [1] $ 139.8 $ 5.6 $ (3.7)
[1] Reclassifications to net income are primarily related to the release of accumulated foreign currency translation reserves during the period in which a JHG entity is disposed of.