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Note 8 - Debt | 3 Months Ended
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Mar. 31, 2025
Notes to Financial Statements |
Debt Disclosure [Text Block] | Note 8 — Debt Our debt as of March 31, 2025, and December 31, 2024, consisted of the following (in millions):
​ |  | Carrying value |
​ |  | March 31, 2025 |  |  | December 31, 2024 |
5.450% Senior Notes due 2034 |  | $ | 395.2 |  |  | $ | 395.0 |
5.450% Senior Notes Due 2034 The 5.450% Senior Notes due 2034 (“2034 Senior Notes”) have a principal amount of $400.0 million as of March 31, 2025, pay interest at 5.450% semiannually on March 10 and September 10 of each year, and mature on September 10, 2034. The 2034 Senior Notes include unamortized debt discount and issuance costs of $4.8 million at March 31, 2025, which will be accreted over the remaining life of the notes. The unamortized debt discount and issuance costs are recorded as a non-current contra liability in long-term debt in our Condensed Consolidated Balance Sheets. Credit Facility At March 31, 2025, we had a $200 million, unsecured, revolving credit facility (“Credit Facility”). The Credit Facility includes an option for us to request an increase to our borrowing capacity under the Credit Facility of up to an additional $50.0 million. The Credit Facility had a maturity date of June 30, 2028, with two one-year extension options that can be exercised at the discretion of JHG with the lender’s consent on the first and second anniversary of the date of the agreement. We exercised the option to extend the term of the Credit Facility on the first anniversary of the agreement. The revised maturity date of the Credit Facility is June 30, 2029. JHG and its subsidiaries may use the Credit Facility for general corporate purposes. The rate of interest for each interest period is the aggregate of the applicable margin, which is based on our long-term credit rating and the Secured Overnight Financing Rate (“SOFR”) in relation to any loan in U.S. dollars (“USD”), the Sterling Overnight Index Average (“SONIA”) in relation to any loan in British pounds (“GBP”), the Euro Interbank Offered Rate (“EURIBOR”) in relation to any loan in euros (“EUR”) or the Bank Bill Swap Rate (“BBSW”) in relation to any loan in Australian dollars (“AUD”). We are also required to pay a quarterly commitment fee on any unused portion of the Credit Facility, which is based on our long-term credit rating. If our credit rating falls below a certain threshold, as defined in the Credit Facility, our financing leverage ratio cannot exceed 3.00x EBITDA. At March 31, 2025, we were in compliance with all covenants in, and there were no borrowings under, the Credit Facility.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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