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Long-Term Debt - Components of Long-Term Debt (Detail)
€ in Millions, $ in Millions
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Notes $ 465.0   $ 485.7
Other 1.6   1.7
Total debt 466.6   487.4
Less current maturities 0.7   0.7
Total long-term debt 465.9   486.7
Kronos International, Inc | 3.75% Senior Notes      
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Notes $ 465.0 € 400 $ 485.7