Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss, Net of Related Deferred Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	$ (1,025,680)	$ (1,036,494)	$ (1,559,018)	$ (1,604,699)
Total accumulated other comprehensive loss, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	(67,260)	(66,656)	$ (75,318)	$ (73,747)
Defined benefit pension and other postretirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	(70,402)	(70,603)
Unrealized foreign currency translation gain
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	7,745	8,757
Unrealized loss on interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	(919)	(1,721)
Share of other comprehensive loss of equity method investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss, net of tax	$ (3,684)	$ (3,089)