CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 136.1	$ 197.7	$ 89.0
Depreciation and amortization	58.5	59.3	68.5
Sale of business			(4.9)
Land sales		(16.0)	(0.5)
Fixed asset impairment	16.4
Loss on deconsolidation of Basic Water Company ("BWC")	2.0
Noncash interest expense	2.2	2.9	2.9
Benefit plan expense greater than cash funding	8.6	11.4	15.2
Deferred income taxes	0.6	12.1	(7.0)
Distributions from (contributions to) TiO2 manufacturing joint venture, net	(10.5)	3.8	(12.8)
Other, net	10.1	2.3	8.3
Change in assets and liabilities:
Accounts and other receivables, net	81.1	(64.6)	(3.1)
Inventories, net	(204.2)	58.3	13.1
Land held for development, net	21.4	49.6	16.8
Accounts payable and accrued liabilities	3.9	154.3	(32.8)
Income taxes	(0.5)	(1.6)	6.5
Accounts with affiliates	9.4	(24.3)	(4.3)
Other noncurrent assets	(3.4)	(15.9)	(49.5)
Other noncurrent liabilities	(83.9)	53.7	53.5
Other, net	(12.9)	(23.3)	(6.7)
Net cash provided by operating activities	34.9	459.7	152.2
Cash flows from investing activities:
Capital expenditures	(67.6)	(64.1)	(65.5)
Cash, cash equivalents and restricted cash of BWC	(8.6)
Purchases of marketable securities	(73.6)	(4.0)	(3.4)
Proceeds from disposal of marketable securities	2.9	5.2	4.3
Proceeds from sale of business			4.9
Proceeds from land sales		23.4
Other, net	0.2	2.1	2.7
Net cash used in investing activities	(146.7)	(37.4)	(57.0)
Cash flows from financing activities:
Principal payments on indebtedness	(62.0)	(102.3)	(58.5)
Valhi cash dividends paid	(9.0)	(9.0)	(13.6)
Distributions to noncontrolling interest in subsidiaries	(38.9)	(74.4)	(49.4)
Subsidiary treasury stock acquired	(4.0)	(1.5)	(1.0)
Other, net	(0.1)	(1.9)
Net cash used in financing activities	(114.0)	(189.1)	(122.5)
Operating, investing and financial activities	(225.8)	233.2	(27.3)
Cash, cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financial activities	(225.8)	233.2	(27.3)
Effect of exchange rates on cash	(5.1)	(10.6)	13.8
Balance at beginning of year	792.9	570.3	583.8
Balance at end of year	562.0	792.9	570.3
Cash paid for:
Interest, net of amounts capitalized	25.8	29.2	33.1
Income taxes, net	43.7	65.9	24.1
Noncash investing activities:
Change in accruals for capital expenditures	$ 6.6	$ 4.6	$ 5.9