	March 31, 2021			December 31, 2020
8.875% debentures due April 15, 2021	$	55.6		$	55.6
7.000% notes due February 15, 2022		79.3			79.3
6.500% notes due November 15, 2023		75.0			75.0
Term Loan due January 15, 2024 ^(a)		534.7			535.8
6.000% notes due April 1, 2024		61.7			61.7
8.250% notes due July 1, 2027		245.8			245.8
6.625% debentures due April 15, 2029		103.4			103.4
8.500% notes due April 15, 2029		302.1			301.6
8.820% debentures due April 15, 2031		54.5			54.5
Unamortized debt issuance costs		(9.0	)		(9.6	)
Total debt		1,503.1			1,503.1
Less: current portion		140.4			61.1
Long-term debt	$	1,362.7		$	1,442.0

The fair values of the notes and debentures, which were determined using the market approach based upon quoted prices or interest rates available to us for debt obligations with similar terms and maturities, were determined to be Level 2 under the fair value hierarchy. The fair value of our total debt at March 31, 2021 and December 31, 2020 was greater than its book value by approximately $170.6 million and $142.9 million, respectively.

We entered into an $800.0 million senior secured asset-based revolving credit facility (the “ABL Credit Facility”) on September 29, 2017, pursuant to a credit agreement (the “ABL Credit Agreement”). The ABL Credit Facility was amended on October 15, 2018 and was scheduled to mature on September 29, 2022. On April 16, 2021, we amended the ABL Credit Agreement to, among other things, reduce the aggregate commitments under the ABL Credit Facility from $800.0 million to $650.0 million and extend the maturity date to April 16, 2026.

The amount available to be borrowed under the ABL Credit Facility is equal to the lesser of (a) $650.0 million ($800.0 million as of March 31, 2021) and (b) a borrowing base formula based on the amount of accounts receivable, inventory, machinery, equipment and, if we were to so elect in the future subject to the satisfaction of certain conditions, fee-owned real estate of ours and our material domestic subsidiaries, subject to certain eligibility criteria and advance rates (collectively, the “Borrowing Base”). The aggregate amount of real estate, machinery and equipment that can be included in the Borrowing Base formula is limited to $175.0 million.

Borrowings under the ABL Credit Facility bear interest at a rate dependent on the average quarterly availability and is calculated according to a base rate (except in certain circumstances, based on the prime rate) or a Eurocurrency rate (except in certain circumstances, based on LIBOR) plus an applicable margin. As currently amended, the applicable margin for base rate loans ranges from 0.25% to 0.75% and the applicable margin for Eurocurrency loans ranges from 1.25% to 1.75%. In addition, a fee is payable quarterly on the unused portion of the total commitments. This fee accrues at a rate of either 0.25% or 0.375% depending upon the average usage of the facility. Borrowings under the ABL Credit Facility may be used for working capital and general corporate purposes.

Based on our Borrowing Base as of March 31, 2021 and letters of credit, we had approximately $512.0 million borrowing capacity available under the ABL Credit Facility. The weighted average interest rate on borrowings under our ABL Credit Facility was 1.6% and 2.7% during the three months ended March 31, 2021 and 2020, respectively. There were no outstanding borrowings on our ABL Credit Facility as of March 31, 2021 and December 31, 2020.

On October 15, 2018, we entered into a $550.0 million senior secured term loan B (the “Term Loan”) pursuant to a credit agreement (the “Term Loan Credit Agreement”). The Term Loan is scheduled to mature on January 15, 2024, at which time the remaining outstanding balance under the Term Loan will be due and payable. Principal payments of $1.4 million are due quarterly. The Term Loan bears interest based on the London Interbank Offered Rate (LIBOR) plus a margin of 5% or a base rate plus a margin of 4%.

On April 15, 2021, we repaid the remaining $55.6 million aggregate principle of our 8.875% Debentures using a draw on our ABL Credit Facility.

On April 28, 2021, we completed an offering of $400 million aggregate principal amount of 6.125% senior secured notes due 2026 (the “2026 Notes”). The Notes are general senior secured obligations of the Company and are guaranteed by our domestic, wholly-owned subsidiaries that are guarantors of the ABL Credit Facility and Term Loan. Interest on the 2026 Notes is payable semi-annually on May 1 and November 1 of each year, commencing on November 1, 2021. The Notes mature on November 1, 2026.

The ABL Credit Agreement, Term Loan Credit Agreement, and the indenture for the 2026 Notes (the “2026 Notes Indenture”) contain customary affirmative and negative covenants including negative covenants restricting, among other things, our ability to incur or guarantee debt, or issue preferred stock, make certain loans or investments, make certain restricted payments (including payments on certain other debt, external dividends, and stock repurchases), incur liens securing other debt, consummate certain fundamental transactions, enter into certain transactions with affiliates and consummate asset sales. The ABL Credit Agreement contains a covenant which requires us to maintain a minimum fixed charge coverage ratio of 1.0 to 1.0 if availability under the ABL Credit Facility declines below certain levels. The Term Loan Credit Agreement and the 2026 Notes Indenture require that the net cash proceeds of significant asset sales be used to prepay the Term Loan and purchase the 2026 Notes to the extent that the net cash proceeds are not used for reinvestment in assets useful to our business, certain acquisitions and investments, repayment of certain borrowings under our ABL Credit Facility or to reduce, prepay, repay or purchase certain indebtedness, in each case, subject to certain restrictions and limitations set forth in the Term Loan Credit Agreement and the 2026 Notes Indenture.

Interest paid was $22.9 million for the three months ended March 31, 2021 and $23.5 million for the three months ended March 31, 2020.

Interest income was $0.4 million for the three months ended March 31, 2021 and $0.5 million for the three months ended March 31, 2020.