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Note 13 - Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Balance $ 4,899.9 $ 4,474.8 $ 4,718.1 $ 4,538.3
Total other comprehensive income (loss) (50.9) 220.7 146.4 184.9
Less: other comprehensive loss (income) attributable to noncontrolling interests (24.3) 7.2 9.3 6.5
Balance 4,908.0 4,633.2 4,908.0 4,633.2
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Balance (225.5) (514.8) (387.9) (478.9)
Other comprehensive income (loss) (51.0) 108.4 145.0 88.3
Reclassifications to net income(1) [1] (0.6) 111.9 (0.6) 95.4
Total other comprehensive income (loss) (51.6) 220.3 144.4 183.7
Less: other comprehensive loss (income) attributable to noncontrolling interests 24.3 (7.2) (9.3) (6.5)
Balance (252.8) (301.7) (252.8) (301.7)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Balance (96.0) (83.9) (97.3) (84.7)
Other comprehensive income (loss) 0.0 0.0 0.0 0.0
Reclassifications to net income(1) [1] 0.7 0.4 2.0 1.2
Total other comprehensive income (loss) 0.7 0.4 2.0 1.2
Less: other comprehensive loss (income) attributable to noncontrolling interests 0.0 0.0 0.0 0.0
Balance (95.3) (83.5) (95.3) (83.5)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]        
Balance (321.5) (598.7) (485.2) (563.6)
Other comprehensive income (loss) (51.0) 108.4 145.0 88.3
Reclassifications to net income(1) [1] 0.1 112.3 1.4 96.6
Total other comprehensive income (loss) (50.9) 220.7 146.4 184.9
Less: other comprehensive loss (income) attributable to noncontrolling interests 24.3 (7.2) (9.3) (6.5)
Balance $ (348.1) $ (385.2) $ (348.1) $ (385.2)
[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 liquidated.