Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 1,803,101	$ 1,970,445	$ 4,648,109	$ 4,956,112
Cost of goods sold	1,517,183	1,662,680	3,874,100	4,140,968
Gross profit	285,918	307,765	774,009	815,144
Selling, general and administrative expenses	84,320	96,680	287,821	320,521
Rationalization charges	6,424	2,726	13,212	7,533
Other pension and postretirement expense (income)	1,083	(11,051)	3,664	(33,729)
Income before interest and income taxes	194,091	219,410	469,312	520,819
Interest and other debt expense before loss on early extinguishment of debt	47,264	33,743	130,822	91,752
Loss on early extinguishment of debt	0	0	0	1,481
Interest and other debt expense	47,264	33,743	130,822	93,233
Income before income taxes	146,827	185,667	338,490	427,586
Provision for income taxes	36,210	46,964	76,954	111,333
Net income	$ 110,617	$ 138,703	$ 261,536	$ 316,253
Earnings per share
Basic net income per share (usd per share)	$ 1.02	$ 1.26	$ 2.39	$ 2.86
Diluted net income per share (usd per share)	$ 1.02	$ 1.25	$ 2.38	$ 2.85
Weighted average number of shares
Basic (in shares)	108,421	110,281	109,583	110,572
Effect of dilutive securities (in shares)	331	460	428	548
Diluted (in shares)	108,752	110,741	110,011	111,120