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Note 13 - Accumulated Other Comprehensive Loss - Schedule of Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Total other comprehensive loss, pre tax |  | $ 59.8 | $ (48.0)
Total other comprehensive loss, tax |  | 2.1 | 2.8
Total other comprehensive loss, net |  | 61.9 | (45.2)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Total other comprehensive loss, pre tax |  | 58.8 | (26.4)
Total other comprehensive loss, tax |  | 2.1 | 2.8
Total other comprehensive loss, net |  | 60.9 | (23.6)
Reclassification to Net Income [Member] |  |  |
Total other comprehensive loss, pre tax | [1] | 1.0 | (21.6)
Total other comprehensive loss, tax | [1] | 0.0 | 0.0
Total other comprehensive loss, net | [1] | $ 1.0 | $ (21.6)
[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.

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