Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 3,490,742
Other comprehensive income before reclassifications	42,132	$ (295)
Amounts reclassified from accumulated other comprehensive loss	10,730	13,037
Other comprehensive income, net of income taxes	52,862	12,742
Ending balance	3,595,740
Pension and Other Post-Retirement Benefits
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(463,227)	(692,868)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	6,989	9,296
Other comprehensive income, net of income taxes	6,989	9,296
Ending balance	(456,238)	(683,572)
Cash Flow Hedges
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(15,042)	(30,007)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	3,741	3,741
Other comprehensive income, net of income taxes	3,741	3,741
Ending balance	(11,301)	(26,266)
Foreign Currency Translation
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(379,470)	(313,627)
Other comprehensive income before reclassifications	42,132	(295)
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income, net of income taxes	42,132	(295)
Ending balance	(337,338)	(313,922)
Total
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(857,739)	(1,036,502)
Ending balance	$ (804,877)	$ (1,023,760)