Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit costs/(income)	$ 1,050	$ (684)	$ 3,124	$ (2,053)
Total reclassification, before tax	(85,043)	(69,987)	(227,781)	(162,721)
Income tax expense	(20,900)	(16,372)	(57,681)	(40,211)
Total reclassification, net of tax	$ (64,143)	$ (53,615)	(170,100)	$ (122,510)
Amounts reclassified from accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax			9,890
Income tax expense			2,625
Total reclassification, net of tax			7,265
Amounts reclassified from accumulated other comprehensive loss | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit costs/(income)			(1,459)
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit costs/(income)			11,322
Amounts reclassified from accumulated other comprehensive loss | Pension settlement charge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit costs/(income)			$ 27