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Note 18 - Earnings and Dividends Per Share (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Net income attributable to JHG |  | $ | 408.9 |  |  | $ | 392.0 |  |  | $ | 372.4 |
Allocation of earnings to participating stock-based awards |  |  | (9.9 | ) |  |  | (11.2 | ) |  |  | (11.3 | )
Net income attributable to JHG common shareholders |  | $ | 399.0 |  |  | $ | 380.8 |  |  | $ | 361.1 |
​ |  | ​ |  |  | ​ |  |  | ​ |
Weighted-average common shares outstanding — basic |  |  | 155.4 |  |  |  | 160.4 |  |  |  | 161.7 |
Dilutive effect of nonparticipating stock-based awards |  |  | 0.4 |  |  |  | 0.1 |  |  |  | 0.3 |
Weighted-average common shares outstanding — diluted |  |  | 155.8 |  |  |  | 160.5 |  |  |  | 162.0 |
​ |  | ​ |  |  | ​ |  |  | ​ |
Earnings per share: |  | ​ |  |  | ​ |  |  | ​ |
Basic |  | $ | 2.57 |  |  | $ | 2.37 |  |  | $ | 2.23 |
Diluted |  | $ | 2.56 |  |  | $ | 2.37 |  |  | $ | 2.23 |
Dividends Declared [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Dividends paid per share |  | $ | 1.56 |  |  | $ | 1.56 |  |  | $ | 1.55 |

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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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