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v3.25.3

Note 16 - Commitments and Contingencies (Details Textual) $ in Millions | Sep. 30, 2025 USD ($)
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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