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Lines of Credit and Financing Arrangements
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Lines of Credit and Financing Arrangements
13. Lines of Credit and Financing Arrangements:

The following tables summarize our outstanding debt obligations and their classification in the accompanying Consolidated Balance Sheets (in millions):
As of December 31,
20232022
Commercial paper:$150.0 $— 
Current maturities of long-term debt:
Asset securitization program$— $350.0 
Finance lease obligations12.1 11.2 
Senior unsecured notes— 350.0 
Debt issuance costs— (0.6)
Total current maturities of long-term debt$12.1 $710.6 
Long-Term Debt:
Finance lease obligations32.7 28.3 
Credit agreement20.0 192.0 
Senior unsecured notes1,100.0 600.0 
Debt issuance costs(9.6)(6.1)
Total long-term debt$1,143.1 $814.2 
Total debt$1,305.2 $1,524.8 

As of December 31, 2023, the aggregate amounts of required principal payments on total debt excluding finance lease obligations (see Note 5) were as follows (in millions):
2024$150.0 
2025300.0 
202620.0 
2027300.0 
2028500.0 
Thereafter— 
Commercial Paper Program

On October 25, 2023, we established a commercial paper program (the “Program”) pursuant to which we may issue short-term, unsecured commercial paper notes (the “CP Notes”) under the exemption from registration contained in Section 4(a)(2) of the Securities Act. Amounts available under the Program may be borrowed, repaid, and re-borrowed from time to time, with the aggregate face or principal amount of the CP Notes outstanding under the Program at any time not to exceed $500.0 million. The CP Notes will have maturities of up to 397 days from the date of issue. The CP Notes will rank pari passu with all of our other unsecured and unsubordinated indebtedness. The net proceeds of the issuances of the CP Notes are expected to be used for general corporate purposes. We plan to use our revolving credit facility as a liquidity backstop for the repayment of CP Notes outstanding under the Program. We had outstanding CP Notes of $150.0 million as of December 31, 2023.

Below is a summary of the weighted average interest rate for CP notes as of December 31, 2023 and 2022:
As of December 31,
20232022
Weighted average borrowing rate5.66 %— %
Long-Term Debt

Credit Agreement

In August 2023, we entered into the Second Amendment (the “Second Amendment”) to our existing Credit Agreement, dated as of July 14, 2021 (as amended, the "Credit Agreement"), with JPMorgan Chase Bank, N.A., as administrative agent, and the other lenders party thereto. Under the Second Amendment, the revolving commitments were increased by $350 million and certain representations required to be made as conditions precedent to borrowing were revised to provide us greater flexibility to enter into additional future financings.

The Credit Agreement consists of a $1,100.0 million unsecured revolving credit facility that matures in July 2026. We had outstanding borrowings of $20.0 million as well as $1.7 million committed to standby letters of credit as of December 31, 2023. Subject to covenant limitations, $928.3 million was available for future borrowings after taking into consideration outstanding borrowings under our Commercial Paper Program. The revolving credit facility includes a subfacility for swingline loans of up to $65.0 million. The Credit Agreement will expire and outstanding loans will be required to be repaid in July 2026, unless maturity is extended by the lenders pursuant to two one-year extension options that we may request under the Credit Agreement.

Below is a summary of the weighted average interest rate as of December 31, 2023 and 2022:
As of December 31,
20232022
Weighted average borrowing rate6.67 %5.57 %
The Credit Agreement is guaranteed by certain of our subsidiaries and contains customary covenants applicable to us and its subsidiaries including limitations on indebtedness, liens, dividends, stock repurchases, mergers and sales of all or substantially all of its assets. In addition, the Credit Agreement contains a financial covenant requiring us to maintain, as of the last day of each fiscal quarter for the four prior fiscal quarters, a Total Net Leverage Ratio of no more than 3.50 to 1.00 (or, at our election, on up to two occasions following a material acquisition, 4.00 to 1.00).

Our Credit Agreement contains customary events of default. These events of default include nonpayment of principal or other amounts, material inaccuracy of representations and warranties, breach of covenants, default on certain other indebtedness or receivables securitizations (cross default), certain voluntary and involuntary bankruptcy events and the occurrence of a change in control. A cross default under our credit facility could occur if:

•We fail to pay any principal or interest when due on any other indebtedness or receivables securitization exceeding $75.0 million; or
•We are in default in the performance of, or compliance with any term of any other indebtedness in an aggregate principal amount exceeding $75.0 million, or any other condition exists which would give the holders the right to declare such indebtedness due and payable prior to its stated maturity.

Each of our major debt agreements contains provisions by which a default under one agreement causes a default in the others (a cross default). If a cross default under our Credit Agreement or our senior unsecured notes were to occur, it could have a wider impact on our liquidity than might otherwise occur from a default of a single debt instrument or lease commitment.

If any event of default occurs and is continuing, the administrative agent, or lenders with a majority of the aggregate commitments may require the administrative agent to, terminate our right to borrow under our Credit Agreement and accelerate amounts due under our Credit Agreement (except for a bankruptcy event of default, in which case such amounts will automatically become due and payable and the lenders’ commitments will automatically terminate).

In the event of a credit rating downgrade below investment grade resulting from a change of control, holders of our senior unsecured notes will have the right to require us to repurchase all or a portion of the senior unsecured notes at a repurchase price equal to 101% of the principal amount of the notes, plus accrued and unpaid interest, if any. The notes are guaranteed, on a senior unsecured basis, by each of our subsidiaries that guarantee payment by us of any indebtedness under our Credit Agreement. The indenture governing the notes contains covenants that, among other things, limit our ability and the ability of the subsidiary guarantors to: create or incur certain liens; enter into certain sale and leaseback transactions; enter into certain mergers, consolidations and transfers of substantially all of our assets; and transfer certain properties. The indenture also contains a cross default provision which is triggered if we default on other debt of at least $75 million in principal which is then accelerated, and such acceleration is not rescinded within 30 days of the notice date.
As of December 31, 2023, we believe we were in compliance with all covenant requirements.

Senior Unsecured Notes

In September 2023, we issued $500.0 million of senior unsecured notes, which will mature in September 2028 (the "2028 Notes") with interest being paid semi-annually in March and September at 5.50%. We issued two series of senior unsecured notes on July 30, 2020 for $300.0 million each, which will mature on August 1, 2025 (the "2025 Notes") and August 1, 2027 (the "2027 Notes") with interest being paid semi-annually on February and August at 1.35% and 1.70% respectively, per annum (the 2025 Notes, the 2027 Notes, and the 2028 Notes, collectively the “Notes”).

All the Notes are guaranteed, on a senior unsecured basis, by certain of our subsidiaries that guarantee indebtedness under our Credit Agreement. The indenture governing the Notes contains covenants that, among other things, limit our ability and the ability of the subsidiary guarantors to: create or incur certain liens; enter into certain sale and leaseback transactions; and enter into certain mergers, consolidations and transfers of substantially all of our assets. The indenture also contains a cross default provision which is triggered if we default on other debt of at least $75 million in principal which is then accelerated, and such acceleration is not rescinded within 30 days of the notice date. As of December 31, 2023, we believe we were in compliance with all covenant requirements.