Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive (Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 3,204,796
Other comprehensive income (loss) before reclassifications	126,539	$ 52,387
Amounts reclassified from accumulated other comprehensive loss	52,224	52,419
Net current period other comprehensive income (loss)	178,763	104,806
Ending balance	3,490,742	3,204,796
Pension and Other Post-Retirement Benefits
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(692,868)	(704,415)
Other comprehensive income (loss) before reclassifications	192,382	(17,343)
Amounts reclassified from accumulated other comprehensive loss	37,259	28,890
Net current period other comprehensive income (loss)	229,641	11,547
Ending balance	(463,227)	(692,868)
Cash Flow Hedges
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(30,007)	(20,671)
Other comprehensive income (loss) before reclassifications	0	(21,509)
Amounts reclassified from accumulated other comprehensive loss	14,965	12,173
Net current period other comprehensive income (loss)	14,965	(9,336)
Ending balance	(15,042)	(30,007)
Foreign Currency Translation
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(313,627)	(416,222)
Other comprehensive income (loss) before reclassifications	(65,843)	91,239
Amounts reclassified from accumulated other comprehensive loss	0	11,356
Net current period other comprehensive income (loss)	(65,843)	102,595
Ending balance	(379,470)	(313,627)
Total
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(1,036,502)	(1,141,308)
Ending balance	$ (857,739)	$ (1,036,502)