Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,320,796
Components of other comprehensive income (loss):
Before reclassifications to income and retained earnings	18,020
Reclassifications to income	3,336
Other comprehensive income	21,356	$ 25,723
Balance at end of period	4,204,290	$ 4,099,609
Foreign Currency Translation Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(311,895)
Components of other comprehensive income (loss):
Before reclassifications to income and retained earnings	18,020
Reclassifications to income	0
Other comprehensive income	18,020
Balance at end of period	(293,875)
Retirement and Postretirement Benefit Plan Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(215,816)
Components of other comprehensive income (loss):
Before reclassifications to income and retained earnings	0
Reclassifications to income	3,336
Other comprehensive income	3,336
Balance at end of period	(212,480)
Reclassifications before taxes, included in net periodic benefit expense	(4,210)
Deferred Loss on Interest Rate Derivative Hedges
Components of other comprehensive income (loss):
Reclassifications, income tax expense	874
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(527,711)
Components of other comprehensive income (loss):
Balance at end of period	$ (506,355)