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Debt and Other Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Debt and Other Financing Arrangements |
|  | (in thousands) |
December 31, |  | 2020 |  |  | 2019 |
Industrial revenue bonds due from 2022 to 2040* |  | $ | 1,153,240 |  |  | $ | 1,010,600 |
Notes, 4.125%, due 2022 |  |  | 600,000 |  |  |  | 600,000 |
Notes, 4.000%, due 2023 |  |  | 500,000 |  |  |  | 500,000 |
Notes, 2.000%, due 2025 |  |  | 500,000 |  |  |  | — |
Notes, 3.950%, due 2028 |  |  | 500,000 |  |  |  | 500,000 |
Notes, 2.700%, due 2030 |  |  | 500,000 |  |  |  | — |
Notes, 6.400%, due 2037 |  |  | 543,331 |  |  |  | 650,000 |
Notes, 5.200%, due 2043 |  |  | 338,133 |  |  |  | 500,000 |
Notes, 4.400%, due 2048 |  |  | 329,219 |  |  |  | 500,000 |
Notes, 2.979%, due 2055 |  |  | 439,317 |  |  |  | — |
Finance lease obligations |  |  | 90,338 |  |  |  | 85,224 |
Total long-term debt and finance lease obligations |  |  | 5,493,578 |  |  |  | 4,345,824 |
Less premium on debt exchange |  |  | 180,045 |  |  |  | — |
Less debt issuance costs |  |  | 30,859 |  |  |  | 25,259 |
Total amounts outstanding |  |  | 5,282,674 |  |  |  | 4,320,565 |
Less current maturities of long-term debt |  |  | — |  |  |  | 20,000 |
Less current portion of finance lease obligations |  |  | 10,885 |  |  |  | 9,264 |
Total long-term debt and finance lease obligations due after one year |  | $ | 5,271,789 |  |  | $ | 4,291,301 |
* | The industrial revenue bonds had variable rates ranging from 0.16% to 0.19% at December 31, 2020 and 1.61% to 1.82% at December 31, 2019.

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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=6877327&loc=d3e13212-122682 Reference 2: 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=114775744&loc=d3e28541-108399 Reference 3: 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=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: 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=114775744&loc=d3e28551-108399 Reference 6: 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=109259400&loc=d3e21521-112644 Reference 7: 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=109259400&loc=d3e21538-112644 Reference 8: 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=75038535&loc=d3e64711-112823 Reference 9: 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 10: 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=109259400&loc=d3e21475-112644 + Details
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