14. Debt
We had the following debt outstanding as of December 31, 2025 and 2024:
(in millions)December 31, 2025December 31, 2024
Senior unsecured debt due 2029$124.2 $125.0 
Less: unamortized debt issuance costs(2.9)(3.6)
Senior unsecured debt121.3 121.4 
The following table presents estimated future repayments of long-term debt as of December 31, 2025, excluding the debt issuance costs which will be amortized over the remaining term:
For the Years Ended
(in millions)Total20262027202820292030
Senior unsecured debt$124.2 $3.1 $5.9 $5.7 $109.5 $— 
We have a credit agreement that consists of senior unsecured syndicated US dollar denominated loan facility with a September 2029 maturity date, as well as a $50 million revolving credit facility (all of which was unutilized and available as of December 31, 2025). Each borrowing under the revolving credit facility may have a maturity of one, three or six months, at our election, but may not extend beyond the credit agreement’s maturity date. Such borrowings may be repaid early.
The senior unsecured debt represents an unsecured obligation and includes a delayed draw term loan ("DDTL") feature that allows us to withdraw predefined amounts. We may draw down up to an additional $75 million upon request, subject to the agreement of the lenders.
Partial quarterly repayments of the aggregate principal amount are required until the maturity date as reflected in the table above. Interest payments on the senior notes are due at the end of each period, being a certain month or quarter during which the applicable interest rate has been reset. The interest rate is subject to a sliding scale based on our consolidated senior debt to capitalization ratio and varies between a 3.4% and 4.0% spread in addition to the Secured Overnight Financing Rate ("SOFR"). Interest is calculated based on a 360-day year of twelve 30-day months. Interest expense for the years ended December 31, 2025, 2024 and 2023 was $10.9 million, $12.1 million and $10.9 million, respectively.
Subject to conditions of optional prepayment, we may voluntarily prepay the senior unsecured debt at any time and from time to time, prior to the maturity date without penalty. Any prepayment, in whole or in part, shall include any accrued and unpaid interest thereon to, but excluding, the prepayment date. Any amounts we prepay may not be reborrowed.
The senior notes contain certain restrictive and maintenance covenants customary for facilities of this type, including restrictions on minimum consolidated net worth, maximum leverage levels and a minimum interest coverage ratio. As of December 31, 2025, we were in compliance with all such covenants.

About Debt Disclosures

Debt disclosures detail a company's borrowing structure — the types of instruments, interest rates, maturity schedule, and covenant restrictions that define its financial obligations and flexibility. This section is essential for assessing refinancing risk, interest rate exposure, and the margin of safety against financial distress.

Key signals: the maturity schedule reveals concentration risk — large maturities within 1-2 years during tight credit markets can force dilutive refinancing or asset sales. Compare the fair value of debt against carrying amount to gauge whether the market views the company's credit risk differently than the balance sheet suggests. Watch covenant compliance disclosures for tightening cushions, especially leverage and interest coverage ratios. Variable-rate debt exposure quantifies sensitivity to interest rate changes. Secured versus unsecured mix affects recovery rates and future borrowing capacity. Compare net debt-to-EBITDA against industry peers and covenant limits to assess financial health.