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Debt and Credit Facility | 3 Months Ended
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Mar. 31, 2023
Debt Disclosure [Abstract] |
Debt and Credit Facility | 6. Debt and Cr edit Facility Senior Notes During the years ended December 31, 2021 and December 31, 2019, we issued fixed rate unsecured notes with varying maturity dates (“Senior Notes”). The stated interest rates and aggregate principal amounts of our Senior Notes were: (i) 4.50% and $550.0 million (“4.50% Senior Notes”) and (ii) 4.625% and $500.0 million (“4.625% Senior Notes”). Our Senior Notes do not require us to make any mandatory redemptions or sinking fund payments. The following table summarizes key details of our Senior Notes:
|  |  |  |  |  | Outstanding (in millions of dollars) |
|  | Issuance Date |  | Maturity |  | Effective Interest Rate |  | As of March 31, 2023 |  |  | As of December 31, 2022 |
4.50% Senior Notes |  | May 2021 |  | June 2031 |  | 4.7% |  | $ | 550.0 |  |  | $ | 550.0 |
4.625% Senior Notes |  | November 2019 |  | March 2028 |  | 4.8% |  |  | 500.0 |  |  |  | 500.0 |
Total debt |  |  |  |  |  |  |  |  | 1,050.0 |  |  |  | 1,050.0 |
Unamortized issuance costs |  |  |  |  |  |  |  |  | (11.5 | ) |  |  | (11.9 | )
Total carrying amount |  |  |  |  |  |  |  | $ | 1,038.5 |  |  | $ | 1,038.1 |
The following table presents the fair value of our outstanding Senior Notes, which are Level 1 liabilities (in millions of dollars):
|  |  |  |  |  | As of March 31, 2023 |  |  | As of December 31, 2022 |
4.50% Senior Notes |  |  |  |  |  | $ | 451.7 |  |  | $ | 438.7 |
4.625% Senior Notes |  |  |  |  |  | $ | 445.3 |  |  | $ | 440.4 |
Revolving Credit Facility In October 2019, we entered into a revolving credit facility with Wells Fargo Bank, National Association, as administrative agent, and the other financial institutions party thereto, which was subsequently amended three times in March 2021, December 2021 and April 2022 (as amended, the “Revolving Credit Facility”). The Revolving Credit Facility contains a maximum commitment amount of $575.0 million (of which up to a maximum of $50.0 million may be utilized for letters of credit) and a maturity date of April 2027. Our effective interest rate on outstanding borrowings under the Revolving Credit Facility is based on the rates of Base Rate Loans an d SOFR Loans (as defined in the Revolving Credit Facility). For borrowings outstanding during the quarter ended March 31, 2023, the rate for Base Rate Loans was equal to the prevailing Prime Rate plus 0.25%, while the rate for SOFR Loans, which are made for one or three month periods, was equal to the Term SOFR Reference Rate (as defined in the Revolving Credit Facility) plus 1.35%. Outstanding borrowings under the Revolving Credit Facility are reported within Long-term debt, net, on our Consolidate d Balance Sheets. The following table summarizes availability and usage of our Revolving Credit Facility as determined by a borrowing base calculated as of March 31, 2023 (in millions of dollars):
Revolving Credit Facility borrowing commitment |  | $ | 575.0 |
Borrowing base availability |  | $ | 575.0 |
Less: Outstanding borrowings under Revolving Credit Facility |  |  | (39.4 | )
Less: Outstanding letters of credit under Revolving Credit Facility |  |  | (21.6 | )
Remaining borrowing availability |  | $ | 514.0 |
Interest Expense The following table presents i nterest expense relating to our Senior Notes and Revolving Credit Facility (in millions of dollars):
|  | Quarter Ended March 31, |
|  | 2023 |  |  | 2022 |
Senior Notes, including debt issuance cost amortization |  | $ | 12.4 |  |  | $ | 12.4 |
Revolving Credit Facility, including commitment fees and finance cost amortization |  |  | 0.9 |  |  |  | 0.4 |
Interest expense capitalized as construction in progress |  |  | (1.4 | ) |  |  | (0.6 | )
Total interest expense |  | $ | 11.9 |  |  | $ | 12.2 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://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 https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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