Document And Entity Information |
Jul. 31, 2025 |
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| Document Information [Line Items] | |
| Entity, Registrant Name | JANUS HENDERSON GROUP PLC |
| Document, Type | 8-K |
| Document, Period End Date | Jul. 31, 2025 |
| Entity, File Number | 001-38103 |
| Entity, Incorporation, State or Country Code | Y9 |
| Entity, Tax Identification Number | 98-1376360 |
| Entity, Address, Address Line One | 201 Bishopsgate |
| Entity, Address, City or Town | London |
| Entity, Address, Country | GB |
| Entity, Address, Postal Zip Code | EC2M3AE |
| City Area Code | (0) 20 |
| Local Phone Number | 7818 1818 |
| Title of 12(b) Security | Common Stock, $1.50 Per Share Par Value |
| Trading Symbol | JHG |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001274173 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD. No definition available.
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- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'. No definition available.
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- Definition Address Line 1 such as Attn, Building Name, Street Name No definition available.
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- Definition Two-character EDGAR code representing the state or country of incorporation. No definition available.
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- Definition Local phone number for entity. No definition available.
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Title of a 12(b) registered security. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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