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Note 17 - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Balance $ 4,538.3 $ 4,362.6 $ 4,638.9
Total other comprehensive income (loss) 72.9 87.2 (262.7)
Less: other comprehensive loss (income) attributable to noncontrolling interests (5.5) 3.1 (2.0)
Balance 4,718.1 4,538.3 4,362.6
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
Balance (478.9) (577.3)  
Other comprehensive income (loss) (52.6) 96.8  
Reclassifications to net income(1) [1] 138.1 4.7  
Total other comprehensive income (loss) 85.5 101.5  
Less: other comprehensive loss (income) attributable to noncontrolling interests 5.5 (3.1)  
Balance (387.9) (478.9) (577.3)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
Balance (84.7) (70.4)  
Other comprehensive income (loss) (14.3) (15.2)  
Reclassifications to net income(1) [1] 1.7 0.9  
Total other comprehensive income (loss) (12.6) (14.3)  
Less: other comprehensive loss (income) attributable to noncontrolling interests 0.0 0.0  
Balance (97.3) (84.7) (70.4)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]      
Balance (563.6) (647.7)  
Other comprehensive income (loss) (66.9) 81.6  
Reclassifications to net income(1) [1] 139.8 5.6  
Total other comprehensive income (loss) 72.9 87.2  
Less: other comprehensive loss (income) attributable to noncontrolling interests 5.5 (3.1)  
Balance $ (485.2) $ (563.6) $ (647.7)
[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.