v3.25.2
Long-term debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Long-term debt    
Revolving credit facility $ 37.0 $ 10.0
Total debt 589.3 507.4
Less current maturities 87.9 78.3
Total long-term debt 501.4 429.1
Subordinated, Unsecured Term Loan from Contran    
Long-term debt    
Subordinated debt 53.7 53.7
Kronos International, Inc | 9.50% Senior Secured Notes due 2029    
Long-term debt    
Kronos International, Inc. 410.7 365.4
Kronos International, Inc | 3.75% Senior Secured Notes due 2025    
Long-term debt    
Kronos International, Inc. $ 87.9 $ 78.3