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Long-Term Debt - Senior Secured Notes - Additional Information (Detail)
€ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Aggregate principal amount outstanding $ 449.7   $ 452.4
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025      
Debt Instrument [Line Items]      
Aggregate principal amount outstanding $ 449.7 € 400 $ 452.4
Debt instrument interest rate 3.75% 3.75%  
Unamortized debt issuance costs $ 5.8    
Debt instrument maturity date Sep. 15, 2025