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Note 13 - Accumulated Other Comprehensive Loss - Schedule of Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Total other comprehensive loss, pre tax |  | $ (51.1) | $ 222.1 | $ 144.9 | $ 183.6
Total other comprehensive loss, tax |  | 0.2 | (1.4) | 1.5 | 1.3
Total other comprehensive loss, net |  | (50.9) | 220.7 | 146.4 | 184.9
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Total other comprehensive loss, pre tax |  | (51.2) | 109.8 | 143.5 | 87.0
Total other comprehensive loss, tax |  | 0.2 | (1.4) | 1.5 | 1.3
Total other comprehensive loss, net |  | (51.0) | 108.4 | 145.0 | 88.3
Reclassification to Net Income [Member] |  |  |  |  |
Total other comprehensive loss, pre tax | [1] | 0.1 | 112.3 | 1.4 | 96.6
Total other comprehensive loss, tax | [1] | 0.0 | 0.0 | 0.0 | 0.0
Total other comprehensive loss, net | [1] | $ 0.1 | $ 112.3 | $ 1.4 | $ 96.6
[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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