Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of	$ 4,070,482	$ 4,001,868	$ 3,769,730	$ 3,752,661	$ 4,001,868	$ 3,752,661
Other Comprehensive Loss, Net of Tax	(5,315)	(22,492)	(4,146)	585	(27,807)	(3,561)
As of	3,995,520	4,070,482	3,832,525	$ 3,769,730	3,995,520	3,832,525
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		614,337			614,337
Other comprehensive (loss) income before reclassifications					(8,445)
Net amount reclassified from accumulated other comprehensive income (loss)					(19,362)
Other Comprehensive Loss, Net of Tax					(27,807)
As of	586,530				586,530
Cumulative Foreign Currency Translation Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		(32,711)			(32,711)
Other comprehensive (loss) income before reclassifications					(9,767)
Net amount reclassified from accumulated other comprehensive income (loss)					0
Other Comprehensive Loss, Net of Tax	3,517		2,384		(9,767)	11,378
As of	(42,478)				(42,478)
Unrealized Gain on Pensions and Other Postretirement Plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		649,185			649,185
Other comprehensive (loss) income before reclassifications					0
Net amount reclassified from accumulated other comprehensive income (loss)	(9,087)		(7,445)		(19,117)	(15,138)
Other Comprehensive Loss, Net of Tax	(9,087)		(7,445)		(19,117)	(15,138)
As of	630,068				630,068
Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		$ (2,137)			(2,137)
Other comprehensive (loss) income before reclassifications					1,322
Net amount reclassified from accumulated other comprehensive income (loss)					(245)
Other Comprehensive Loss, Net of Tax	255		$ 915		1,077	$ 199
As of	$ (1,060)				$ (1,060)