Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of	$ 3,832,525	$ 3,769,730	$ 3,752,661	$ 4,322,243	$ 4,472,941	$ 4,411,669	$ 3,752,661	$ 4,411,669
Other Comprehensive Loss, Net of Tax	(29,893)	(4,146)	585	(55,455)	(52,979)	(13,135)	(33,454)	(121,569)
As of	3,714,141	$ 3,832,525	3,769,730	4,276,961	$ 4,322,243	$ 4,472,941	3,714,141	4,276,961
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 (loss) income before reclassifications							(5,605)
Net amount reclassified from accumulated other comprehensive income (loss)							(27,849)
Other Comprehensive Loss, Net of Tax							(33,454)
As of	302,697						302,697
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 (loss) income before reclassifications							(8,096)
Net amount reclassified from accumulated other comprehensive income (loss)							0
Other Comprehensive Loss, Net of Tax	(19,474)			(44,260)			(8,096)	(86,926)
As of	(62,734)						(62,734)
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 (loss) income before reclassifications							0
Net amount reclassified from accumulated other comprehensive income (loss)	(7,474)			(12,891)			(22,612)	(38,443)
Other Comprehensive Loss, Net of Tax	(7,474)			(12,891)			(22,612)	(38,443)
As of	365,979						365,979
Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
As of			$ 2,198				2,198
Other comprehensive (loss) income before reclassifications							2,491
Net amount reclassified from accumulated other comprehensive income (loss)							(5,237)
Other Comprehensive Loss, Net of Tax	(2,945)			$ 1,696			(2,746)	$ 3,800
As of	$ (548)						$ (548)