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Note 14 - Earnings and Dividends Per Share - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income attributable to JHG $ 142.1 $ 27.3 $ 412.7 $ 287.1
Allocation of earnings to participating stock-based awards (3.3) (0.7) (8.9) (6.8)
Net income attributable to JHG common shareholders $ 138.8 $ 26.6 $ 403.8 $ 280.3
Weighted-average common shares outstanding — basic (in shares) 150.6 154.4 152.8 155.8
Dilutive effect of nonparticipating stock-based awards (in shares) 0.7 0.3 0.6 0.2
Weighted-average common shares outstanding — diluted (in shares) 151.3 154.7 153.4 156.0
Basic (in dollars per share) $ 0.92 $ 0.17 $ 2.64 $ 1.8
Diluted (in dollars per share) $ 0.92 $ 0.17 $ 2.63 $ 1.8