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Debt | 3 Months Ended
--- | ---
Mar. 31, 2021
Debt |
Debt | Note 6. Debt ​ Debt consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​
​ | March 31, | ​ | December 31,
​ | 2021 |  | 2020
​ | (in millions)
Unsecured revolving credit facility maturing September 3, 2025 | $ | — | ​ | $ | —
Senior unsecured notes due April 15, 2023 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes due August 15, 2025 | ​ | 400.0 | ​ | ​ | 400.0
Senior unsecured notes due August 15, 2030 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes due November 15, 2036 | ​ | 250.0 | ​ | ​ | 250.0
Other notes and revolving credit facilities | ​ | 12.9 | ​ | ​ | 13.7
Total | ​ | 1,662.9 | ​ | ​ | 1,663.7
Less: unamortized discount and debt issuance costs | ​ | (18.0) | ​ | ​ | (18.8)
Less: amounts due within one year and short-term borrowings | ​ | (5.2) | ​ | ​ | (6.0)
Total long-term debt | $ | 1,639.7 | ​ | $ | 1,638.9
​ Unsecured Credit Facility ​ On September 3, 2020, we entered into a $1.5 billion unsecured five-year Amended and Restated Credit Agreement (“Credit Agreement”) that amended and restated our existing $1.5 billion unsecured revolving credit facility. At March 31, 2021, borrowings under the Credit Agreement were available at variable rates based on LIBOR plus 1.25% or the bank prime rate plus 0.25% and we pay a commitment fee at an annual rate of 0.20% on the unused portion of the revolving credit facility. The applicable margins over LIBOR and base rate borrowings, along with commitment fees, are subject to adjustment every quarter based on our leverage ratio, as defined in the Credit Agreement. All borrowings under the Credit Agreement may be prepaid without penalty. Our Credit Agreement includes provisions to change the reference rate to the then-prevailing market convention for similar agreements if a replacement rate for LIBOR is necessary during its term. ​ As of March 31, 2021, we had no outstanding borrowings and $32.3 million of letters of credit issued on the revolving credit facility. ​ Senior Unsecured Notes ​ On November 20, 2006, we entered into an indenture (the “2006 Indenture”) for the issuance of $600.0 million of unsecured debt securities. The total issuance was comprised of (a) $350.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 6.20% per annum, which matured and were repaid on November 15, 2016 and (b) $250.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 6.85% per annum, maturing on November 15, 2036. ​ On April 12, 2013, we entered into an indenture (the “2013 Indenture”) for the issuance of $500.0 million aggregate principal amount of senior unsecured notes at the rate of 4.50% per annum, maturing on April 15, 2023. ​ On August 3, 2020, we entered into an indenture (the “2020 Indenture” and, together with the 2013 Indenture and 2006 Indenture, the “Indentures”) for the issuance of $900.0 million of unsecured debt securities. The total issuance was comprised of (a) $400.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 1.30% per annum, maturing on August 15, 2025 and (b) $500.0 million aggregate principal amount of senior unsecured notes bearing interest at the rate of 2.15% per annum, maturing on August 15, 2030. ​ Under the Indentures, the notes are senior unsecured obligations and rank equally in right of payment with all of our existing and future unsecured and unsubordinated obligations. If we experience a change in control accompanied by a downgrade in our credit rating, we will be required to make an offer to repurchase each series of the notes at a price equal to 101% of their principal amount plus accrued and unpaid interest. ​ Other Notes and Revolving Credit Facilities ​ A revolving credit facility with a credit limit of $8.3 million is in place for an operation in Asia with an outstanding balance of $4.6 million and $5.4 million as of March 31, 2021 and December 31, 2020, respectively. ​ Various industrial revenue bonds had combined outstanding balances of $8.3 million as of March 31, 2021 and December 31, 2020, and have maturities through 2027. ​ Covenants ​ The Credit Agreement and the Indentures include customary representations, warranties, covenants and events of default provisions. The covenants under the Credit Agreement include, among other things, two financial maintenance covenants that require us to comply with a minimum interest coverage ratio and a maximum leverage ratio. We were in compliance with all financial maintenance covenants in our Credit Agreement at March 31, 2021.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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