Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 1,176,470	$ 1,093,163	$ 2,206,854	$ 2,120,294
Cost of goods sold	952,375	909,650	1,797,661	1,770,784
Gross profit	224,095	183,513	409,193	349,510
Selling, general and administrative expenses	100,624	80,087	190,487	157,749
Rationalization charges	1,942	39,317	4,741	45,400
Other pension and postretirement income	(9,705)	(4,490)	(19,410)	(8,980)
Income before interest and income taxes	131,234	68,599	233,375	155,341
Interest and other debt expense before loss on early extinguishment of debt	25,837	28,401	49,326	55,505
Loss on early extinguishment of debt	0	0	1,481	0
Interest and other debt expense	25,837	28,401	50,807	55,505
Income before income taxes	105,397	40,198	182,568	99,836
Provision for income taxes	27,225	9,243	46,796	22,140
Net income	$ 78,172	$ 30,955	$ 135,772	$ 77,696
Earnings per share
Basic net income per share (usd per share)	$ 0.70	$ 0.28	$ 1.22	$ 0.70
Diluted net income per share (usd per share)	$ 0.70	$ 0.28	$ 1.22	$ 0.70
Weighted average number of shares
Basic (in shares)	110,901	111,185	110,879	110,945
Effect of dilutive securities (in shares)	433	317	501	600
Diluted (in shares)	111,334	111,502	111,380	111,545