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Long-Term Debt - Senior Secured Notes - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Aggregate principal amount outstanding $ 435.1   $ 442.6
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025      
Debt Instrument [Line Items]      
Aggregate principal amount outstanding $ 435.1 € 400 $ 442.6
Debt instrument interest rate 3.75% 3.75%  
Unamortized debt issuance costs $ 4.9    
Debt instrument maturity date Sep. 15, 2025