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Note 9 - Leases (Details Textual) | 12 Months Ended
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Dec. 31, 2024
Minimum [Member] |
Lessee, Remaining Lease Term (Year) | 1 year
Maximum [Member] |
Lessee, Remaining Lease Term (Year) | 9 years

X
- Definition Remaining term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | jhg_LesseeRemainingLeaseTerm
Namespace Prefix: | jhg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |