See “Note 13. Debt” of the Notes to Consolidated Financial Statements section of the Fiscal 2018 Form 10-K for additional information on our debt and interest rates on that debt.

The following table shows the carrying value of the individual components of our debt (in millions):

	March 31, 2019		September 30, 2018
Public bonds due fiscal 2019 to 2022	$	1,114.1	$	1,470.9
Public bonds due fiscal 2023 to 2028		3,271.3		2,534.4
Public bonds due fiscal 2029 to 2033		1,707.8		964.1
Public bonds due fiscal 2037 to 2047		179.1		178.5
Term loan facilities		2,905.8		599.4
Revolving credit and swing facilities		527.2		355.0
Receivables-backed financing facility		150.0		—
Commercial paper		588.3		—
Capital lease obligations		189.0		171.0
Supplier financing and commercial card programs		130.1		105.1
International and other debt		32.8		36.8
Total debt		10,795.5		6,415.2
Less: current portion of debt		1,422.4		740.7
Long-term debt due after one year	$	9,373.1	$	5,674.5

A portion of the debt classified as long-term may be paid down earlier than scheduled at our discretion without penalty. Certain customary restrictive covenants govern the maximum availability under our credit facilities. We test and report our compliance with these covenants as required and were in compliance with all of our covenants at March 31, 2019.

The estimated fair value of our debt was approximately $11.0 billion as of March 31, 2019 and $6.4 billion at September 30, 2018. The fair value of our long-term debt is categorized as level 2 within the fair value hierarchy and is primarily either based on quoted prices for those or similar instruments or approximates the carrying amount as the variable interest rates reprice frequently at observable current market rates.

On December 3, 2018, WRKCo issued $750.0 million aggregate principal amount of 4.65% senior notes due 2026 (the “2026 Notes”) and $750.0 million aggregate principal amount of 4.90% senior notes due 2029 (the “2029 Notes” and, together with the 2026 Notes, the “December 2018 Notes”) in an unregistered offering pursuant to Rule 144A and Regulation S under the Securities Act of 1933, as amended (the “Securities Act”), at a discount of approximately $1.1 million and $0.4 million, respectively. In connection with issuing the December 2018 Notes, we recorded debt issuance costs of $6.0 million and $6.2 million, respectively, which are being amortized over the respective terms of the December 2018 Notes. Giving effect to the amortization of the original issue discount and the debt issuance costs, the effective interest rates of the December 2018 Notes were 4.80% and 5.01%, respectively, at March 31, 2019. The Company, WestRock MWV, LLC (“MWV”) and WestRock RKT, LLC (“RKT”) have guaranteed WRKCo’s obligations under the December 2018 Notes. We may redeem the 2026 Notes and the 2029 Notes, in whole or in part, at any time at specified redemption prices, plus accrued and unpaid interest, if any. The proceeds from the issuance of the December 2018 Notes were used primarily to prepay a portion of the amounts outstanding under our Delayed Draw Credit Facilities (as defined below).

During the quarter ended March 31, 2019, we conducted offers to exchange WRKCo’s $500.0 million aggregate principal amount of 3.00% Senior Notes due 2024 (the “2024 Notes”), $600.0 million aggregate principal amount of 3.75% Senior Notes due 2025 (the “2025 Notes”), 2026 Notes, $500.0 million aggregate principal amount of 3.375% Senior Notes due 2027 (the “2027 Notes”), $600.0 million aggregate principal amount of 4.00% Senior Notes due 2028 (the “2028 Notes”) and 2029 Notes for new notes of the applicable series with terms substantially identical with the notes of such series that are registered under the Securities Act. As a result of the exchange offer, $490.0 million in aggregate principal amount of the 2024 Notes, $600.0 million in aggregate principal amount of the 2025 Notes, $749.3 million in aggregate principal amount of the 2026 Notes, $491.0 million in aggregate principal amount of the 2027 Notes, $590.0 million in aggregate principal amount of the 2028 Notes and $750.0 million in aggregate principal amount of the 2029 Notes were validly tendered and subsequently exchanged.

On March 7, 2018, we entered into a credit agreement that provides for $3.8 billion of senior unsecured term loans, consisting of a 364-day $300.0 million term loan, a 3-year $1.75 billion term loan and a 5-year $1.75 billion term loan (collectively, the “Delayed Draw Credit Facilities”). On November 2, 2018, in connection with the closing of the KapStone Acquisition, we drew upon the facility in full. The proceeds of the Delayed Draw Credit Facilities and other sources of cash were used to pay the consideration for the KapStone Acquisition, to repay certain existing indebtedness of KapStone and to pay fees and expenses incurred in connection with the KapStone Acquisition. The Delayed Draw Credit Facilities are senior unsecured obligations of WRKCo, as borrower, and each of the Company, RKT and MWV, respectively, as guarantors.

On December 3, 2018, in connection with the issuance of the December 2018 Notes, we repaid the $300.0 million 364-day term loan under the Delayed Draw Credit Facilities, and prepaid $926.5 million of the 3-year term loan and $262.5 million of the 5-year term loan. At March 31, 2019, there was $822.5 million outstanding on the 3-year term loan and $1,483.9 million outstanding on the 5-year term loan.

At our option, loans issued under the Delayed Draw Credit Facilities will bear interest at a floating rate based on either LIBOR or an alternate base rate, in each case plus an applicable interest rate margin. The applicable interest rate margin was initially 1.125% to 2.000% per annum for LIBOR rate loans and 0.125% to 1.000% per annum for alternate base rate loans, in each case depending on the Leverage Ratio (as defined in the credit agreement) or our corporate credit ratings, whichever yields a lower applicable interest rate margin, at such time. On February 26, 2019, we amended the Delayed Draw Credit Facilities agreement. The applicable interest rate margin for the 3-year term loan is now 1.000% to 1.875% for LIBOR rate loans and 0.000% to 0.875% for alternate base rate loans. The applicable interest rate margin for the 5-year term loan is now 1.000% to 1.950% for LIBOR rate loans and 0.000% to 0.950% for alternate base rate loans. Loans under the Delayed Draw Credit Facilities may be prepaid at any time without premium. We have recorded debt issuance costs of $7.5 million, which are being amortized over the respective terms of the Delayed Draw Credit Facilities.

On July 22, 2016, we entered into a $700.0 million sixth amended and restated receivables sale agreement with certain originators (the “Receivables Facility”) that matures on July 22, 2019. At March 31, 2019 and September 30, 2018, maximum available borrowings, excluding amounts outstanding under the Receivables Facility, were $526.4 million and $571.0 million, respectively. The carrying amount of accounts receivable collateralizing the maximum available borrowings at March 31, 2019 and September 30, 2018 were approximately $795.8 million and $887.0 million, respectively. We have continuing involvement with the underlying receivables as we provide credit and collections services pursuant to the Receivables Facility agreement.

On April 27, 2018, we entered into a €500.0 million revolving credit facility with an incremental €100.0 million accordion feature with Coöperatieve Rabobank U.A., New York Branch as the administrative agent for the syndicate of banks. This facility provides for a 3-year unsecured U.S. dollar, Euro and Sterling denominated borrowing of not more than €500.0 million and matures on April 27, 2021. At March 31, 2019, we had borrowed $460.0 million under this facility and entered into foreign currency exchange contracts of $461.4 million as an economic hedge for the U.S dollar denominated borrowing plus interest by a non-U.S. dollar functional currency entity. The net of gains or losses from these foreign currency exchange contracts and the changes in the remeasurement of the U.S. dollar denominated borrowing in our foreign subsidiaries have been immaterial to our condensed consolidated statements of income.

On October 31, 2017, we established an unsecured commercial paper program, pursuant to which we were able to issue short-term, unsecured commercial paper notes in an aggregate principal amount at any time not to exceed $1.0 billion with up to 397-day maturities. On December 7, 2018, we terminated the commercial paper program and established a new unsecured commercial paper program with WRKCo as the issuer. Under the new program, we may issue short-term unsecured commercial paper notes in an aggregate principal amount at any time not to exceed $1.0 billion with up to 397-day maturities. The commercial paper program has no expiration date and can be terminated by either the agent or us with not less than 30 days’ notice. Our $2.0 billion unsecured revolving credit facility is intended to backstop the commercial paper program. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds from issuances of notes under the program were used to repay amounts outstanding under the KapStone securitization facility that was assumed in the KapStone Acquisition and subsequently terminated, and have been, and are expected to continue to be, used for general corporate purposes. At March 31, 2019, there was $588.3 million outstanding and the average borrowing rate was 2.77%. As of March 31, 2019, $250.0 million of the total amount outstanding was classified as long-term debt.

On April 10, 2019, we entered into a credit agreement to provide for BRL 750.0 million of senior unsecured term loans with an incremental BRL 250.0 million accordion feature (the “Brazil Delayed Draw Credit Facilities”). The principal can be drawn at any time over the initial 18 months in up to 10 drawdowns of at least BRL 50.0 million each and will be repaid in equal, semiannual installments beginning on April 10, 2021 until the facility matures on April 10, 2024. On April 15, 2019, we borrowed BRL 125.0 million under the facility. The proceeds of the Brazil Delayed Draw Credit Facilities are to be used for supporting the production of goods or acquisition of inputs that are essential or ancillary to export activities. The Brazil Delayed Draw Credit Facilities are senior unsecured obligations of Rigesa Celulose, Papel E Embalagens Ltda., as borrower, and the Company, as guarantor. Loans issued under the Brazil Delayed Draw Credit Facilities will bear interest at a floating rate based on Brazil’s Certificate of Interbank Deposit rate plus a spread of 1.50%. In addition, we will be required to pay fees of 0.45% on the unused amount of the facility. The debt issuance costs are being amortized over the term of the Brazil Delayed Draw Credit Facilities.

As of March 31, 2019, the aggregate maturities of debt, excluding capital lease obligations, for the remainder of the current fiscal year and the succeeding four fiscal years and thereafter were as follows (in millions):

Remaining fiscal 2019	$	1,056.6
Fiscal 2020		468.2
Fiscal 2021		352.7
Fiscal 2022		2,251.8
Fiscal 2023		527.7
Thereafter		5,766.6
Fair value of debt step-up, deferred financing costs and unamortized bond discounts		182.9
Total	$	10,606.5

As of March 31, 2019, the aggregate maturities of capital lease obligations for the remainder of the current fiscal year and the succeeding four fiscal years and thereafter were as follows (in millions):

Remaining fiscal 2019	$	3.5
Fiscal 2020		6.1
Fiscal 2021		4.3
Fiscal 2022		3.5
Fiscal 2023		1.9
Thereafter		151.8
Fair value of debt step-up, deferred financing costs and unamortized bond discounts		17.9
Total	$	189.0