Debt and Other Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Schedule of Debt and Other Financing Arrangements

	(in thousands)
December 31,	2022		2021
Industrial revenue bonds due from 2022 to 2061 (1)	$	1,349,230	$	1,350,230
Notes, 4.125%, due 2022		—		600,000
Notes, 4.000%, due 2023		—		500,000
Notes, 2.000%, due 2025		500,000		500,000
Notes, 3.950%, due 2025		500,000		—
Notes, 4.300%, due 2027		500,000		—
Term notes, 2.950%, due 2027 (2)		67,866		—
Notes, 3.950%, due 2028		500,000		500,000
Notes, 2.700%, due 2030		500,000		500,000
Notes, 3.125%, due 2032		550,000		—
Notes, 6.400%, due 2037		543,331		543,331
Notes, 5.200%, due 2043		338,133		338,133
Notes, 4.400%, due 2048		329,219		329,219
Notes, 3.850%, due 2052		550,000		—
Notes, 2.979%, due 2055		439,312		439,312
Finance lease obligations		188,386		179,053
Total long-term debt and finance lease obligations		6,855,477		5,779,278
Less premium on debt exchange		169,737		174,891
Less debt issuance costs		43,471		27,299
Total amounts outstanding		6,642,269		5,577,088
Less current maturities of long-term debt (2)		10,000		601,000
Less current portion of finance lease obligations		18,582		14,678
Total long-term debt and finance lease obligations due after    one year	$	6,613,687	$	4,961,410

(1) The industrial revenue bonds had variable rates ranging from 3.65% to 4.28% at December 31, 2022 and 0.14% to 0.18% at December 31, 2021.

(2)   The term notes were assumed in conjunction with the acquisition of 51% ownership of CSI on February 1, 2022.  The original principal amount of the notes was $101.0 million, with a fixed rate of 2.95% until September 30, 2026 when they will convert to a floating rate equal to LIBOR plus 1.00%. Payments of $2.5 million are due quarterly along with accrued interest. The term notes mature on March 31, 2027. (See Note 25.)