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Debt | 12 Months Ended
--- | ---
Dec. 31, 2021
Debt |
Debt | Note 9. Debt ​ Debt consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | December 31,
​ | 2021 |  | 2020
​ | (in millions)
Unsecured revolving credit facility maturing September 3, 2025 | $ | — | ​ | $ | —
Senior unsecured notes, interest payable semi-annually at 4.50%, effective rate of 4.63%, maturing April 15, 2023 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, maturing August 15, 2025 | ​ | 400.0 | ​ | ​ | 400.0
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036 | ​ | 250.0 | ​ | ​ | 250.0
Other notes and revolving credit facilities | ​ | 12.4 | ​ | ​ | 13.7
Total | ​ | 1,662.4 | ​ | ​ | 1,663.7
Less: unamortized discount and debt issuance costs | ​ | (15.4) | ​ | ​ | (18.8)
Less: amounts due within one year and short-term borrowings | ​ | (5.0) | ​ | ​ | (6.0)
Total long-term debt | $ | 1,642.0 | ​ | $ | 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 then-existing $1.5 billion unsecured credit facility. At December 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 December 31, 2021 and 2020, we had no outstanding borrowings under the Credit Agreement. As of December 31, 2021, we had $8.9 million of letters of credit issued under the Credit Agreement. ​ Senior Unsecured Notes ​ 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 the notes at a price equal to 101% of their principal amount plus accrued and unpaid interest. ​ Other Notes, Revolving Credit and Letters of Credit/Guarantee Facilities ​ A revolving credit facility with a credit limit of $8.5 million is in place for an operation in Asia with an outstanding balance of $4.7 million and $5.4 million as of December 31, 2021 and 2020, respectively. ​ Various industrial revenue bonds had combined outstanding balances of $7.7 million and $8.3 million as of December 31, 2021 and 2020, respectively, and have maturities through 2027. ​ A standby letters of credit/letters of guarantee agreement with one of the lenders under our Credit Agreement provides letters of credit or letters of guarantee in an amount not to exceed $50.0 million in the aggregate. As of December 31, 2021, a total of $19.0 million of letters of credit/guarantee were issued on the facility. At December 31, 2021, we also had a total of $4.2 million of letters of credit issued by other banks for our 2021 acquisitions. ​ 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 covenants in our Credit Agreement at December 31, 2021. ​ 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)
2022 | $ | 5.0
2023 | ​ | 506.0
2024 | ​ | 0.3
2025 | ​ | 400.3
2026 | ​ | 0.4
Thereafter | ​ | 750.4
​ | $ | 1,662.4
​

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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