Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 227,531	$ 227,487	$ (200,306)	$ 612,167
Foreign currency translation adjustments, net of income taxes in 2020 — $22,896 and $19,451; 2019 — $(17,773) and $21,468, respectively	34,063	(78,298)	(36,951)	(30,325)
Cash flow hedge adjustments, net of income taxes in 2020 — $1,313 and $4,731; 2019 — $(787) and $6,413, respectively	3,550	(2,127)	(12,792)	(17,340)
Pension and postretirement benefit adjustments, net of income taxes in 2020 — $2,998 and $9,023; 2019 — $2,592 and $6,166, respectively	8,187	7,024	24,479	16,689
Other comprehensive income (loss), net of income taxes	45,800	(73,401)	(25,264)	(30,976)
Comprehensive income (loss)	$ 273,331	$ 154,086	$ (225,570)	$ 581,191