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Long-Term Debt - Components of Long-Term Debt (Detail)
€ in Millions, $ in Millions
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Secured Notes $ 484.9   $ 471.1
Other 3.2   3.4
Total debt 488.1   474.5
Less current maturities 0.7   0.7
Total long-term debt 487.4   473.8
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025      
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Secured Notes $ 484.9 € 400 $ 471.1