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Long-Term Debt - Components of Long-Term Debt (Detail)
€ in Millions, $ in Millions
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Notes $ 464.7   $ 442.6
Other 2.7   2.9
Total debt 467.4   445.5
Less current maturities 1.5   1.5
Total long-term debt 465.9   444.0
Kronos International, Inc | 3.75% Senior Notes      
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Notes $ 464.7 € 400 $ 442.6