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Note 17 - Accumulated Other Comprehensive Loss - Schedule of Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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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.

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