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Long-Term Debt (Details Textual)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2012
CAD
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2011
EUR (€)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
EUR (€)
Sep. 30, 2011
EUR (€)
Dec. 31, 2011
EUR (€)
Jun. 30, 2012
Kronos US Subsidiaries [Member]
Jun. 30, 2012
Kronos Canada [Member]
Jun. 30, 2012
Kronos [Member]
USD ($)
Jun. 30, 2012
Kronos International [Member]
USD ($)
Jun. 30, 2012
CompX [Member]
May 31, 2012
NL Industries Inc [Member]
USD ($)
Jun. 30, 2012
NL Industries Inc [Member]
Jun. 30, 2012
Letter of Credit [Member]
USD ($)
Jun. 30, 2012
Letter of Credit [Member]
CAD
Jun. 30, 2012
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2011
Senior Secured Notes Repurchased Aggregate [Member]
USD ($)
Dec. 31, 2011
Senior Secured Notes Repurchased Aggregate [Member]
EUR (€)
Jun. 30, 2012
Senior Secured Notes Repurchased Aggregate [Member]
EUR (€)
Long-Term Debt (Textual) [Abstract]                                            
Term Loan $ 400.0         $ 400.0           $ 394.0                    
Additional term loan borrowings 100         100                                
Percentage of term loan issued 98.50% 98.50%       98.50% 98.50%                              
Minimum LIBOR rate for Kornos Option           1.00% 1.00%                              
Variable rate on LIBOR for term loan           4.75% 4.75%                              
Variable Rate on Base Rate for term loan           3.75% 3.75%                              
Common stock of certain of Kronos U.S. wholly-owned subsidiaries/Common stock or other ownership interest of Kronos Canadian subsidiary                   100.00% 65.00%                      
Unsecured promissory note issued by Kronos wholly-owned subsidiary                         362.1                  
Principal repayments           5.0                                
Specified financial covenant (leverage to EBITDA)           3.5 to 1.0 3.5 to 1.0                              
Provision for other indebtedness 50         50                                
Carrying amount of term loan includes unamortized original issue discount 6.0         6.0                                
Principal amount of notes       115.7 80.0     40.8 40.8                     57.6 40.6  
6.5% Senior secured notes         400.0                                  
Interest rate of senior secured notes       6.50% 6.50%       6.50%                          
Effective percentage senior secured notes       102.17% 102.17%                                  
Call premium of senior long term notes       2.5                                    
Principal amount outstanding                                           279.2
Pre tax charge on redemption of senior long term notes       3.3   7.2                                
Term loan sufficient to pay principal, call premium           1.01083% 1.01083%                              
Variable rate on LIBOR for revolving credit facility, Minimum           1.50% 1.50%                              
Variable rate on LIBOR for revolving credit facility, Maximum           2.00% 2.00%                              
Variable Rate on Base Rate for revolving credit facility, Minimum           0.50% 0.50%                              
Variable Rate on Base Rate for revolving credit facility, Maximum           1.00% 1.00%                              
Fixed charge coverage ratio, Range Start           1.0 1.0                              
Fixed charge coverage ratio, Range End           1.0 1.0                              
Borrowings under credit facility           107.4 80.0                              
Average interest rate on revolving bank credit facility 6.25% 6.25%       5.75% 5.75%             3.40%                
Average interest rate on revolving bank credit facility 1.88% 1.88%       1.88% 1.88%             3.80%                
Promissory note issued in conjunction with a litigation settlement     1.00     1.25                 3.90              
Average interest rate 1.94% 1.94%       1.94% 1.94%                              
Letters of credit outstanding   7.3                                        
Amount available for borrowing                                     125      
Borrowing availability $ 15.0         $ 15.0                     $ 25.0 10.0 $ 125.0      
Interest rate for promissory note                           1.50%   3.25%            
Interest rate on outstanding indebtedness                           1.50%   3.25%