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Note 16 - Commitments and Contingencies (Details Textual) $ in Millions	Sep. 30, 2025 USD ($)
Capital Commitments, Seeded Investment Product	$ 15

X

- Definition

The amount for the capital commitments to fund the seeded investment product.

+ References

No definition available.

+ Details

Name:	jhg_CapitalCommitmentsSeededInvestmentProduct
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant