XML 118 R97.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Note 15 - Long-term Incentive Compensation - Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Stock-based payments expense | $ 70.8 | $ 74.9 | $ 90.3
Liability settled | 71.7 | 77.4 | 90.6
Social Security costs | 10.2 | 9.5 | 10.5
Profits interests and other, net | 0.9 | 1.5 | (4.8)
Long-term incentive plans | 166.6 | 167.4 | 180.7
Deferred Incentive Plan [Member] |  |  |
Stock-based payments expense | 66.4 | 70.6 | 84.0
Liability settled | 84.7 | 81.5 | 84.7
Other Share Based Award Plan [Member] |  |  |
Stock-based payments expense | $ 4.4 | $ 4.3 | $ 6.3

X
- Definition The amount of social security costs in relation to the share based payment plans. + References No definition available. + Details
Name: | jhg_ShareBasedAwardPlanSocialSecurityCosts
Namespace Prefix: | jhg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of profits interests and other in relation to the share based payment plan. + References No definition available. + Details
Name: | jhg_SharebasedAwardPlanProfitInterestsAndOther
Namespace Prefix: | jhg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost expensed and capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=jhg_DeferredIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=jhg_OtherShareBasedAwardPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |