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Long-Term Debt - Components of Long-Term Debt (Detail)
€ in Millions, $ in Millions
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Kronos International, Inc. 3.75% Senior Secured Notes $ 463.0   $ 471.1
Other 2.9   3.4
Total debt 465.9   474.5
Less current maturities 0.7   0.7
Total long-term debt 465.2   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 $ 463.0 € 400 $ 471.1