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Debt | 12 Months Ended
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Dec. 31, 2018
Debt |
Debt | Note 9. Debt Debt consisted of the following:
| December 31, |  | December 31,
| 2018 |  | 2017
| (in millions)
Unsecured revolving credit facility due September 30, 2021 | $ | 925.0 |  | $ | 538.0
Unsecured term loan due from March 29, 2019 to September 30, 2021 |  | 525.0 |  |  | 562.5
Senior unsecured notes due April 15, 2023 |  | 500.0 |  |  | 500.0
Senior unsecured notes due November 15, 2036 |  | 250.0 |  |  | 250.0
Other notes and revolving credit facilities |  | 14.2 |  |  | 64.0
Total |  | 2,214.2 |  |  | 1,914.5
Less: unamortized discount and debt issuance costs |  | (10.5) |  |  | (13.1)
Less: amounts due within one year and short-term borrowings |  | (65.2) |  |  | (92.0)
Total long-term debt | $ | 2,138.5 |  | $ | 1,809.4
Unsecured Credit Facility On September 30, 2016, we entered into a $2.1 billion unsecured five-year credit agreement (“Credit Agreement”) comprised of a $1.5 billion unsecured revolving credit facility and a $600.0 million unsecured term loan, with an option to increase the revolving credit facility up to an additional $500.0 million at our request, subject to approval of the lenders and certain other customary conditions. The term loan due September 30, 2021 amortizes in quarterly installments, with an annual amortization of 10% until June 2021, with the balance to be paid at maturity. Interest on borrowings from the revolving credit facility and term loan at December 31, 2018 was at variable rates based on LIBOR plus 1.25% or the bank prime rate plus 0.25% and included a commitment fee at an annual rate of 0.15% 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. Weighted average interest rates on borrowings outstanding on the revolving credit facility were 3.86% and 2.96% as of December 31, 2018 and December 31, 2017, respectively. Weighted average interest rates on borrowings outstanding on the term loan were 3.77% and 2.82% as of December 31, 2018 and December 31, 2017, respectively. As of December 31, 2018, we had $925.0 million of outstanding borrowings, $42.0 million of letters of credit issued and $533.0 million available for borrowing 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 debt issued was comprised of two tranches, (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” and, together with the 2006 Indenture, the “Indentures”), 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. 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 repurchase the notes at a price equal to 101% of their principal amount plus accrued and unpaid interest. Other Notes and Revolving Credit Facilities Revolving credit facilities with a combined credit limit of approximately $10.0 million are in place for operations in Asia with combined outstanding balances of $4.7 million and $5.8 million as of December 31, 2018 and December 31, 2017, respectively. Revolving credit facilities in Europe with combined outstanding balances of $48.1 million as of December 31, 2017 were repaid and cancelled during 2018. Various industrial revenue bonds had combined outstanding balances of $9.5 million and $10.1 million as of December 31, 2018 and December 31, 2017, respectively, and have maturities through 2027. Covenants The Credit Agreement and the Indentures include customary representations, warranties, covenants, acceleration, indemnity 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. Debt Maturities The following is a summary of aggregate maturities of long‑term debt for each of the next five years and thereafter:
| (in millions)
2019 | $ | 65.2
2020 |  | 60.6
2021 |  | 1,330.7
2022 |  | 0.3
2023 |  | 506.0
Thereafter |  | 251.4
| $ | 2,214.2

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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