Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of	$ 3,769,730	$ 3,752,661	$ 4,472,941	$ 4,411,669	$ 3,752,661	$ 4,411,669
Other Comprehensive Loss, Net of Tax	(4,146)	585	(52,979)	(13,135)	(3,561)	(66,114)
As of	3,832,525	3,769,730	4,322,243	$ 4,472,941	3,832,525	4,322,243
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		336,151			336,151
Other comprehensive income (loss) before reclassifications					11,986
Net amount reclassified from accumulated other comprehensive income					(15,547)
Other Comprehensive Loss, Net of Tax					(3,561)
As of	332,590				332,590
Cumulative Foreign Currency Translation Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		(54,638)			(54,638)
Other comprehensive income (loss) before reclassifications					11,378
Net amount reclassified from accumulated other comprehensive income					0
Other Comprehensive Loss, Net of Tax	2,384		(40,928)		11,378	(42,666)
As of	(43,260)				(43,260)
Unrealized Gain on Pensions and Other Postretirement Plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		388,591			388,591
Other comprehensive income (loss) before reclassifications					0
Net amount reclassified from accumulated other comprehensive income	(7,445)		(12,891)		(15,138)	(25,552)
Other Comprehensive Loss, Net of Tax	(7,445)		(12,891)		(15,138)	(25,552)
As of	373,453				373,453
Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of		$ 2,198			2,198
Other comprehensive income (loss) before reclassifications					608
Net amount reclassified from accumulated other comprehensive income					(409)
Other Comprehensive Loss, Net of Tax	915		$ 840		199	$ 2,104
As of	$ 2,397				$ 2,397