Debt and Other Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Debt and Other Financing Arrangements

	December 31,
(in thousands)	2023		2022
Industrial revenue bonds due from 2025 to 2061 (1)	$	1,349,230	$	1,349,230
NJSM notes due from 2024 to 2026 (2)		80,000		—
Notes, 2.000%, due 2025		500,000		500,000
Notes, 3.950%, due 2025		500,000		500,000
Notes, 4.300%, due 2027		500,000		500,000
Term notes, 2.950%, due 2027 (3)		58,040		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		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		550,000
Notes, 2.979%, due 2055		439,312		439,312
Finance lease obligations		188,889		188,386
Total long-term debt and finance lease obligations		6,926,154		6,855,477
Less premium on debt exchange		171,162		169,737
Less debt issuance costs		32,017		43,471
Total amounts outstanding		6,722,975		6,642,269
Less current maturities of long-term debt (2) (3)		60,000		10,000
Less current portion of finance lease obligations		14,102		18,582
Total long-term debt and finance lease obligations due after    one year	$	6,648,873	$	6,613,687

(1)The industrial revenue bonds had variable rates ranging from 4.20% to 5.10% at December 31, 2023 and 3.65% to 4.28% at December 31, 2022.

(2)The NJSM notes relate to borrowings of NJSM under its General Financing Agreement and Promissory Note (the “NJSM Facility”). The maximum amount NJSM could borrow under the NJSM facility was $80.0 million at December 31, 2023. The NJSM facility is uncommitted. Borrowings under the NJSM facility had variable rates ranging from 2.46% to 6.78% at December 31, 2023.

(3)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. Payments of $2.5 million are due quarterly along with accrued interest. The term notes mature on March 31, 2027. (See Note 25.)