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Note 10 - Noncontrolling Interests - Schedule of Nonredeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Total nonredeemable noncontrolling interests	$ 131.0	$ 126.6
Victory Park Capital Advisors (V P C) [Member]
Total nonredeemable noncontrolling interests	121.0	126.5
Triumph Capital Markets Holdco, LP (T C M) [Member]
Total nonredeemable noncontrolling interests	10.0	0.0
Other [Member]
Total nonredeemable noncontrolling interests	$ 0.0	$ 0.1

X

- Definition

Portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent entity which is not redeemable by the parent entity.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: