CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 197.7	$ 89.0	$ 78.2
Depreciation and amortization	59.3	68.5	56.8
Net gain from:
Sale of business		(4.9)	(3.0)
Land sales	(16.0)	(0.5)	(4.4)
Noncash interest expense	2.9	2.9	2.4
Benefit plan expense greater than cash funding	11.4	15.2	8.9
Deferred income taxes	12.1	(7.0)	7.4
Distributions from (contributions to) TiO2 manufacturing joint venture, net	3.8	(12.8)	(9.3)
Other, net	2.3	8.3	7.7
Change in assets and liabilities:
Accounts and other receivables, net	(64.6)	(3.1)	8.6
Land held for development, net	49.6	16.8	1.1
Inventories, net	58.3	13.1	(8.5)
Accounts payable and accrued liabilities	154.3	(32.8)	(14.6)
Income taxes	(1.6)	6.5	(1.4)
Accounts with affiliates	(24.3)	(4.3)	(1.2)
Other noncurrent assets	(15.9)	(49.5)	(6.1)
Other noncurrent liabilities	53.7	53.5	54.2
Other, net	(23.3)	(6.7)	0.4
Net cash provided by operating activities	459.7	152.2	177.2
Cash flows from investing activities:
Capital expenditures	(64.1)	(65.5)	(59.9)
Proceeds from sale of business		4.9	2.9
Cash, cash equivalents and restricted cash and cash equivalents of business at time of sale			(0.5)
Purchases of marketable securities	(4.0)	(3.4)	(4.9)
Proceeds from land sales	23.4		4.6
Proceeds from disposal of marketable securities	5.2	4.3	4.3
Other, net	2.1	2.7	2.8
Net cash used in investing activities	(37.4)	(57.0)	(50.7)
Indebtedness:
Borrowings			14.9
Principal payments	(102.3)	(58.5)	(11.2)
Deferred financing fees	(1.9)
Valhi cash dividends paid	(9.0)	(13.6)	(27.1)
Distributions to noncontrolling interest in subsidiaries	(74.4)	(49.4)	(37.6)
Subsidiary treasury stock acquired	(1.5)	(1.0)	(3.1)
Net cash used in financing activities	(189.1)	(122.5)	(64.1)
Cash, cash equivalents and restricted cash and cash equivalents - net change from operating, investing and financing activities	233.2	(27.3)	62.4
Effect of exchange rates on cash	(10.6)	13.8	(2.3)
Net change for the year	222.6	(13.5)	60.1
Balance at beginning of year	570.3	583.8	523.7
Balance at end of year	792.9	570.3	583.8
Cash paid for:
Interest, net of amounts capitalized	29.2	33.1	37.9
Income taxes, net	65.9	24.1	33.4
Noncash investing activities:
Changes in accruals for capital expenditures	$ 4.6	$ 5.9	9.1
Receivable from sale of business			$ 0.3