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Note 3 - Consolidation - Unconsolidated VREs (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Unconsolidated VREs [Member] |  |
JHG’s net interest in consolidated VREs | $ 90.3 | $ 73.5

X
- Definition The net carrying amount of the net interest in consolidated voting rights entities assets and liabilities excluding noncontrolling interest. + References No definition available. + Details
Name: | jhg_VotingRightsEntitiesConsolidatedAssetsAndLiabilitiesExcludingNoncontrollingInterestNet
Namespace Prefix: | jhg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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