CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 7.8	$ 22.8
Depreciation and amortization	16.9	15.4
Benefit plan expense (less) greater than cash funding	1.2	(2.7)
Deferred income taxes	5.5	1.8
Other, net	0.4	1.7
Change in assets and liabilities:
Accounts and other receivables, net	(100.9)	(51.0)
Inventories, net	72.7	(28.0)
Land held for development, net	2.0	(0.5)
Accounts payable and accrued liabilities	(66.6)	(73.4)
Accrued environmental remediation and related costs	(0.1)	(56.4)
Income taxes	2.6	2.5
Accounts with affiliates	4.7	5.2
Other, net	7.7	6.7
Net cash used in operating activities	(46.1)	(155.9)
Cash flows from investing activities:
Capital expenditures	(10.6)	(12.8)
Proceeds from disposal of marketable securities	1.1	0.5
Net cash used in investing activities	(9.5)	(12.3)
Cash flows from financing activities:
Borrowings	158.1	145.0
Payments	(99.2)	(112.1)
Payments on long-term debt	(11.7)	(5.4)
Valhi cash dividends paid	(2.3)	(2.3)
Distributions to noncontrolling interest in subsidiaries	(2.4)	(5.3)
Net cash provided by financing activities	42.5	19.9
Cash, cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(13.1)	(148.3)
Effect of exchange rates on cash	(0.5)	1.2
Balance at beginning of period	228.7	378.6
Balance at end of period	215.1	231.5
Cash paid for:
Interest, net of amounts capitalized	27.0	21.1
Income taxes, net	1.1	2.2
Noncash investing activities:
Change in accruals for capital expenditures	$ 2.0	$ 2.8