Related Party Transactions - Summary of Receivables from and Payables to Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Current receivables from affiliates	$ 17.3	$ 2.7
Current payables to affiliates	31.3	22.9
Noncurrent payable to affiliates	18.6	33.5
Other Affiliates \| Other payable
Related Party Transaction [Line Items]
Current payables to affiliates	0.6
Other Affiliates \| Other Receivable
Related Party Transaction [Line Items]
Current receivables from affiliates	0.4	2.7
Louisiana Pigment Company, L.P. \| Trade Items
Related Party Transaction [Line Items]
Current receivables from affiliates	16.9
Current payables to affiliates	19.9	17.1
Valhi \| Income Tax Payable
Related Party Transaction [Line Items]
Current payables to affiliates	10.8	5.8
Related Party [Member]
Related Party Transaction [Line Items]
Current payables to affiliates	31.3	22.9
Noncurrent payable to affiliates	$ 18.6	$ 33.5

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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