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Note 14 - Earnings and Dividends Per Share (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Net income attributable to JHG |  | $ | 120.7 |  |  | $ | 130.1 |
Allocation of earnings to participating stock-based awards |  |  | (2.4 | ) |  |  | (3.0 | )
Net income attributable to JHG common shareholders |  | $ | 118.3 |  |  | $ | 127.1 |
Weighted-average common shares outstanding — basic |  |  | 153.9 |  |  |  | 157.5 |
Dilutive effect of nonparticipating stock-based awards |  |  | 0.6 |  |  |  | 0.2 |
Weighted-average common shares outstanding — diluted |  |  | 154.5 |  |  |  | 157.7 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.77 |  |  | $ | 0.81 |
Diluted |  | $ | 0.77 |  |  | $ | 0.81 |
Dividends Declared [Table Text Block] |
Dividend |  | Date |  | Dividends paid |  | Date
per share |  | declared |  | (in millions) |  | paid
$ | 0.39 |  | January 30, 2025 |  | $ | 61.5 |  | February 27, 2025

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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