| Submission | Nov. 15, 2024 |
| Submission [Line Items] | |
| Central Index Key | 0001274173 |
| Registrant Name | JANUS HENDERSON GROUP PLC |
| Form Type | S-4 |
| Submission Type | S-4 |
| Fee Exhibit Type | EX-FILING FEES |
| Offerings - Offering: 1 | Nov. 15, 2024 USD ($) shares |
| Offering: | |
| Fee Previously Paid | false |
| Other Rule | true |
| Security Type | Debt |
| Security Class Title | 5.450% Senior Notes due 2034 |
| Amount Registered | shares | 400,000,000 |
| Maximum Aggregate Offering Price | $ 400,000,000 |
| Fee Rate | 0.01531% |
| Amount of Registration Fee | $ 61,240 |
| Offering Note | Calculated pursuant to Rule 457(f) under the Securities Act of 1933, as amended. Represents the aggregate principal amount of the 5.450% Senior Notes due 2034 to be offered in the exchange offer to which the registration statement relates. |
| Fees Summary | Nov. 15, 2024 USD ($) |
| Fees Summary [Line Items] | |
| Total Offering | $ 400,000,000 |
| Previously Paid Amount | 0 |
| Total Fee Amount | 61,240 |
| Total Offset Amount | 0 |
| Net Fee | $ 61,240 |
