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Note 3 - Consolidation - Unconsolidated VREs (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Unconsolidated VREs [Member]
JHG’s net interest in consolidated VREs	$ 123.2	$ 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

X

- Details

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