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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |