Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ 1,143,319			$ 1,143,319
Net income	$ 86,933	59,605	$ 87,946	$ 58,139	278,924	$ 284,967	$ 58,583
Pension and post-retirement plan adjustments, net of tax					32,574	31,262	7,683
Unrecognized net gains on available-for-sale securities (Note 19)							2
Unrecognized net loss on hedges (Note 19)					(215)	0	0
Preferred stock dividends					(41)	(41)	(41)
Balance at end of period	1,367,012		1,143,319		1,367,012	1,143,319
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		1,349,650		1,143,442	1,349,650	1,143,442	1,158,347
Net income					278,924	284,967	58,583
Common dividends					(82,303)	(78,718)	(73,447)
Preferred stock dividends					(41)	(41)	(41)
Balance at end of period	1,546,230		1,349,650		1,546,230	1,349,650	1,143,442
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period		$ (141,649)		$ (129,249)	(141,649)	(129,249)	(158,717)
Foreign currency translation adjustments					68,273	(42,462)	21,682
Pension and post-retirement plan adjustments, net of tax					32,574	31,262	7,683
Unrecognized net loss on hedges (Note 19)					(215)
Reclassification of currency translation from accumulated other comprehensive loss into net income (Note 7)					(764)	(1,200)	101
Balance at end of period	$ (41,781)		$ (141,649)		$ (41,781)	$ (141,649)	$ (129,249)