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Debt (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Debt maturing within one year | Debt maturing within one year:
(in Millions) | June 30, 2021 |  | December 31, 2020
Short-term foreign debt (1) | $ | 103.1 |  |  | $ | 98.4 |
Commercial paper (2) | 689.1 |  |  | 146.3 |
Total short-term debt | $ | 792.2 |  |  | $ | 244.7 |
Current portion of long-term debt | 393.6 |  |  | 93.6 |
Total short-term debt and current portion of long-term debt | $ | 1,185.8 |  |  | $ | 338.3 |
____________________ (1) At June 30, 2021, the average effective interest rate on the borrowings was 12.1 percent. (2) At June 30, 2021, the average effective interest rate on the borrowings was 0.53 percent.
Schedule of long-term debt | Long-term debt:
(in Millions) | June 30, 2021 |  |  |  |
Interest Rate Percentage |  | Maturity Date |  | June 30, 2021 |  | December 31, 2020
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1 and $0.1, respectively) | 6.50% |  | 2032 |  | $ | 49.9 |  |  | $ | 51.6 |
Senior notes (less unamortized discount of $0.9 and $1.0, respectively) | 3.20% - 4.50% |  | 2022 - 2049 |  | 2,199.1 |  |  | 2,199.0 |
2017 Term Loan Facility | 1.35% |  | 2022 |  | 700.0 |  |  | 700.0 |
Revolving Credit Facility (1) | 2.78% |  | 2026 |  | — |  |  | — |
Foreign debt | —% - 7.12% |  | 2021 - 2024 |  | 94.2 |  |  | 92.3 |
Debt issuance cost |  |  |  |  | (18.8) |  |  | (19.8) |
Total long-term debt |  |  |  |  | $ | 3,024.4 |  |  | $ | 3,023.1 |
Less: debt maturing within one year |  |  |  |  | 393.6 |  |  | 93.6 |
Total long-term debt, less current portion |  |  |  |  | $ | 2,630.8 |  |  | $ | 2,929.5 |
____________________ (1)Letters of credit outstanding under our Revolving Credit Facility totaled $212.9 million and available funds under this facility were $598.0 million at June 30, 2021.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21538-112644 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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