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Note 10 - Noncontrolling Interests - Schedule of Nonredeemable Noncontrolling Interests (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Total nonredeemable noncontrolling interests | $ 131.0 | $ 126.6
Victory Park Capital Advisors (V P C) [Member] |  |
Total nonredeemable noncontrolling interests | 121.0 | 126.5
Triumph Capital Markets Holdco, LP (T C M) [Member] |  |
Total nonredeemable noncontrolling interests | 10.0 | 0.0
Other [Member] |  |
Total nonredeemable noncontrolling interests | $ 0.0 | $ 0.1

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- Definition Portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent entity which is not redeemable by the parent entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=jhg_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |