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Debt
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Debt Debt
The following table summarizes the components of debt as of September 30, 2023 and December 31, 2022:
September 30,
2023		December 31,
2022
 (in millions)
Revolving credit facility$100.0 $— 
Term loan— 136.8 
Senior notes400.0 400.0 
Finance leases (see Note 8 Leases)14.8 19.1 
514.8 555.9 
Less: unamortized debt issuance costs(4.6)(5.3)
Total debt$510.2 $550.6 
Revolving Credit Facility and Term Loan
On November 1, 2018, the Company entered into a $400.0 million unsecured revolving credit facility that was scheduled to mature in November 2023. On January 2, 2020, the Company entered into an Amended and Restated Credit Agreement to increase the revolving credit facility to $500.0 million and add a term loan facility of $150.0 million, in each case with a maturity date of January 2, 2025. The entire term loan was advanced on January 2, 2020.
On August 23, 2023, the Company entered into a Second Amended and Restated Credit Agreement to increase the revolving credit facility from $500.0 million to $600.0 million, extend the maturity date from January 2, 2025 to August 23, 2028, and refinance and repay in full the remaining balance of the term loan then outstanding under the Amended and Restated Credit Agreement.
As of September 30, 2023, we had $100.0 million of outstanding loans borrowed under the revolving credit facility that were advanced to repay the term loan during the quarter, and there were approximately $22.0 million of letters of credit issued, leaving $478.0 million available. Of the outstanding letters of credit as of September 30, 2023, all are expected to expire in 2024. The majority of our letters of credit obligations support the Company’s various insurance programs and generally renew by their terms each year.
The interest rates under the revolving credit facility are variable based on the daily simple or term Secured Overnight Financing Rate ("SOFR"), plus a 10-basis point credit spread adjustment, or an alternate base rate, in each case plus a margin for borrowing. A commitment fee accrues on the average daily unused portion of the revolving facility. The margin for borrowing and commitment fee rate are determined based on the Company’s leverage as measured by a consolidated total indebtedness to consolidated EBITDA ratio. The margin for borrowing based on SOFR ranges from 1.25% to 2.00% and was set at 1.50% as of September 30, 2023. The commitment fee rate ranges from 0.20% to 0.35% and was set at 0.25% at September 30, 2023. 
The Company's revolving credit facility requires the maintenance of certain ratios related to leverage and interest coverage. As of September 30, 2023, we were in compliance with all such financial covenants. Borrowings under the credit agreement are guaranteed by certain wholly-owned subsidiaries of the Company.
The carrying value of borrowings under our revolving credit approximates fair value because the interest rate adjusts to the market interest rate (Level 3 input). See Note 3 Fair Value Accounting.
During the three months ended September 30, 2023, the Company capitalized $2.0 million of debt issuance costs associated with the amendment and extension of the revolving credit facility. As of September 30, 2023, the Company had $2.5 million of unamortized debt issuance costs related to the revolving credit facility, which are included in other assets on the Consolidated Balance Sheet.
Senior Notes
On April 6, 2021, the Company issued $400.0 million aggregate principal amount of 4.375% senior notes (the “Notes”) that mature in April 2029. Interest on the Notes is payable semiannually in April and October. The Notes are senior unsecured obligations of the Company and are guaranteed on a senior unsecured basis by each of the Company’s domestic subsidiaries that is a guarantor under our revolving credit facility. The terms of the indenture governing the Notes, among other things, limit the ability of the Company and each of its subsidiaries to create liens on assets, enter into sale and leaseback transactions, and consolidate, merge or transfer all or substantially all of its assets and the assets of its subsidiaries. The terms of the indenture also limit the ability of the Company’s non-guarantor subsidiaries to incur certain types of debt.
At any time prior to April 15, 2024, the Company may redeem all or a portion of the Notes at a redemption price equal to 100% of the principal amount of the Notes redeemed, plus an applicable make-whole premium and accrued and unpaid interest to the redemption date. On and after April 15, 2024, the Company may redeem all or a portion of the Notes at redemption prices set forth in the indenture, plus accrued and unpaid interest to the redemption date. If a Change of Control Triggering Event (as defined in the indenture) occurs, the Company must offer to repurchase the Notes at a price equal to 101% of the principal amount of the Notes, plus accrued and unpaid interest to the date of repurchase.
The estimated fair value of the Notes as of September 30, 2023 was $350.5 million based on a quoted market price in a market with little activity (Level 2 input).
In connection with the issuance of the Notes, the Company paid $6.6 million of debt issuance costs.
The remaining principal payments under existing debt agreements as of September 30, 2023 are as follows:
20232024202520262027Thereafter
 (in millions)
Revolving credit facility$— $— $— $— $— $100.0 
Senior notes— — — — — 400.0 
Interest rate hedges
In December 2018, the Company entered into a $100.0 million interest rate swap instrument, effective as of January 2, 2019, to reduce the effect of changes in the variable interest rates associated with the first $100.0 million of borrowings under the Company's committed credit facility. In conjunction with the replacement of LIBOR with SOFR as a benchmark for borrowings under the Amended and Restated Credit Agreement, on July 1, 2023 the swap instrument transitioned from LIBOR to SOFR. The instrument effectively fixed the SOFR component of borrowings under the revolving credit facility at a monthly rate of 2.71% until such instrument's termination. As of September 30, 2023, the Company has recorded an asset of $0.5 million for the fair value of the instrument, all of which is recorded in accumulated other comprehensive loss. The interest rate swap instrument expired in October 2023. See Note 3 Fair Value Accounting.