Business Segments - Reconciliation of Segment Operating Earnings to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Sep. 30, 2023
Segment Reporting [Abstract]
Segment operating earnings	$ 113,784		$ 107,785
Restructuring and related charges, net	(7,381)		(14,590)
Impairment charges		$ (88,800)		$ (93,000)
Non-operating and administrative expenses	(55,087)		(50,717)
Depreciation of corporate assets and amortization	(17,727)		(14,854)
Operating income	33,589		27,624
Other expense, net	(23)		(709)
Interest expense, net	(9,879)		(9,545)
Income before taxes and equity in net income of associated companies	$ 23,687		$ 17,370