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Note 5 - Investments - Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, net	$ (37.0)	$ (59.7)	$ 44.6
Seeded Investment Products [Member]
Purchases and settlements	(127.8)	(227.3)	(88.4)
Sales, settlements and maturities	26.4	2.4	44.5
Investments, net	(101.4)	(224.9)	(43.9)
Securities Investment [Member]
Purchases and settlements	(211.0)	(180.6)	(143.1)
Sales, settlements and maturities	174.0	120.9	187.7
Investments, net	$ (37.0)	$ (59.7)	$ 44.6

X

- Definition

The net cash outflow from trading, available-for-sale securities and held-to-maturity securities and derivatives.

+ References

No definition available.

+ Details

Name:	jhg_ProceedsFromPaymentsForMarketableSecuritiesAndDerivatives
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow associated with the aggregate amount received by the entity through sales, settlements or maturities of marketable securities and derivatives (trading, held-to-maturity, or available-for-sale) during the period.

+ References

No definition available.

+ Details

Name:	jhg_ProceedsFromSalesSettlementsOrMaturitiesOfMarketableSecuritiesAndDerivatives
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow from purchases, settlements or maturities of trading, available-for-sale securities and held-to-maturity securities and derivatives.

+ References

No definition available.

+ Details

Name:	jhg_PurchasesSettlementsAndMaturitiesOfMarketableSecuritiesAndDerivatives
Namespace Prefix:	jhg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentTypeAxis=jhg_SeededInvestmentProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_SecuritiesInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: