Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortization of pension and other postretirement benefit plan items:
Total before tax	$ (285,756)	$ (317,393)	$ (226,780)
Tax expense	43,200	49,645	27,939
Total net of tax	(242,759)	$ (254,663)	$ (63,925)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amortization of pension and other postretirement benefit plan items:
Accumulated foreign currency translation gains	100
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Actuarial gains
Amortization of pension and other postretirement benefit plan items:
Other nonoperating expense (income)	(1,675)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Prior service cost
Amortization of pension and other postretirement benefit plan items:
Other nonoperating expense (income)	176
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Pension and Other Postretirement Benefit Plans
Amortization of pension and other postretirement benefit plan items:
Total before tax	(1,499)
Tax expense	357
Total net of tax	$ (1,142)