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Financing Agreements
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Financing Agreements Financing Agreements
Revolving Credit Agreement
On December 5, 2019, CF Holdings and CF Industries entered into a senior secured Fourth Amended and Restated Credit Agreement (the Revolving Credit Agreement), which amended and restated our Third Amended and Restated Revolving Credit Agreement, as previously amended (referred to herein, as in effect from time to time, as the Prior Credit Agreement), that was scheduled to mature September 18, 2020. The Revolving Credit Agreement provides for a revolving credit facility of up to $750 million with a maturity of December 5, 2024. The Revolving Credit Agreement includes a letter of credit sub-limit of $125 million. Borrowings under the Revolving Credit Agreement may be used for working capital, capital expenditures, acquisitions, share repurchases and other general corporate purposes.
Borrowings under the Revolving Credit Agreement may be denominated in U.S. dollars, Canadian dollars, euros and British pounds, and bear interest at a per annum rate equal to, at our option, an applicable eurocurrency rate or base rate plus, in either case, a specified margin. We are required to pay an undrawn commitment fee on the undrawn portion of the commitments under the Revolving Credit Agreement and customary letter of credit fees. The specified margin and the amount of the commitment fee depend on CF Holdings’ credit rating at the time.
The guarantors under the Revolving Credit Agreement are currently comprised of CF Holdings and CF Holdings’ wholly owned subsidiaries CF Industries Enterprises, LLC (CFE), CF Industries Sales, LLC (CFS), CF USA Holdings, LLC (CF USA) and CF Industries Distribution Facilities, LLC (CFIDF).
As of September 30, 2020, we had unused borrowing capacity under the Revolving Credit Agreement of $750 million and no outstanding letters of credit. There were no borrowings outstanding under the Revolving Credit Agreement as of December 31, 2019. In March 2020, we borrowed $500 million under the Revolving Credit Agreement to ensure we maintained ample financial flexibility in light of the uncertainty in the global markets caused by the COVID-19 pandemic, which we repaid in April 2020. Maximum borrowings under the Revolving Credit Agreement during the nine months ended September 30, 2020 were $500 million. The weighted-average annual interest rate of borrowings under the Revolving Credit Agreement during the nine months ended September 30, 2020 was 2.05%. There were no borrowings under the Prior Credit Agreement during the nine months ended September 30, 2019.
The Revolving Credit Agreement contains representations and warranties and affirmative and negative covenants, including financial covenants. As of September 30, 2020, we were in compliance with all covenants under the Revolving Credit Agreement.
Letters of Credit
In addition to the letter of credit capacity under the Revolving Credit Agreement, as described above, we have also entered into a bilateral agreement providing for up to $145 million of letters of credit. As of September 30, 2020, approximately $126 million of letters of credit were outstanding under this agreement.
Senior Notes
Long-term debt presented on our consolidated balance sheets as of September 30, 2020 and December 31, 2019 consisted of the following debt securities issued by CF Industries:
 Effective Interest RateSeptember 30, 2020December 31, 2019
 Principal
Carrying Amount(1)
Principal
Carrying Amount(1)
(in millions)
Public Senior Notes:
3.450% due June 2023
3.562%$750 $748 $750 $747 
5.150% due March 2034
5.279%750 741 750 740 
4.950% due June 2043
5.031%750 742 750 742 
5.375% due March 2044
5.465%750 741 750 741 
Senior Secured Notes:
3.400% due December 2021
3.782%250 249 250 248 
4.500% due December 2026
4.759%750 739 750 739 
Total long-term debt$4,000 $3,960 $4,000 $3,957 
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(1)Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $9 million and $10 million as of September 30, 2020 and December 31, 2019, respectively, and total deferred debt issuance costs were $31 million and $33 million as of September 30, 2020 and December 31, 2019, respectively. 
Under the indentures (including the applicable supplemental indentures) governing the senior notes due 2023, 2034, 2043 and 2044 identified in the table above (the Public Senior Notes), each series of Public Senior Notes is guaranteed by CF Holdings.
Under the terms of the applicable indenture, the 3.400% senior secured notes due December 2021 (the 2021 Notes) and the 4.500% senior secured notes due December 2026 (the 2026 Notes) identified in the table above (together, the Senior Secured Notes) are guaranteed on a senior secured basis, jointly and severally, by CF Holdings and each current and future domestic subsidiary of CF Holdings (other than CF Industries) that from time to time is a borrower, or guarantees indebtedness, under the Revolving Credit Agreement. The subsidiary guarantors of the Senior Secured Notes currently consist of CFE, CFS, CF USA and CFIDF.
On November 13, 2019, we redeemed in full all of the remaining $500 million outstanding principal amount of the 7.125% senior notes due May 2020 (the 2020 Notes), in accordance with the optional redemption provisions in the indenture governing the 2020 Notes.
On December 13, 2019, we redeemed $250 million principal amount, representing 50% of the $500 million principal amount outstanding immediately prior to such redemption, of the 2021 Notes in accordance with the optional redemption provisions in the indenture governing the 2021 Notes.
Interest on the Public Senior Notes and the Senior Secured Notes is payable semiannually, and the Public Senior Notes and Senior Secured Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.