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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes Disclosure [Line Items]                        
Income tax examination, description                   Tax authorities may in the future examine certain of our U.S. and non-U.S. tax returns and have or may propose tax deficiencies, including penalties and interest. Because of the inherent uncertainties involved in settlement initiatives and court and tax proceedings, we cannot guarantee that these tax matters, if any, will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain.    
U.S. federal statutory income tax rate                   21.00% 21.00% 35.00%
Deferred income tax benefit from change in enacted tax rate     $ 59.7             $ 4.7 $ 58.8 $ (77.1)
Income tax expense (benefit)                   26.5 (30.7) (120.0)
Aggregate provisional non-cash deferred income tax expense                     (1.8)  
Current cash income tax expense for GILTI                   1.8 4.0  
Increase (decrease) in non-cash deferred income tax asset valuation allowance                   4.5   (205.4)
Provision for income taxes includes non-cash deferred income tax expense                   $ 4.5 6.8  
Business interest income, adjusted taxable income                   30.00%    
Current income taxes expense (benefit)                   $ 26.3 85.2 125.8
Deferred income taxes expense (benefit)                   0.2 (115.9) (245.8)
Non-cash income tax benefit       $ 1.4                
Unrecognized tax benefits impact on effective tax rate   $ 13.2               13.2    
Increase (decrease) in unrecognized tax benefits   4.3               4.3    
Accrued interest and penalties during the period                   1.3 1.3 2.1
Accrued interest and penalties end of the period   1.9               $ 1.9 2.2  
Canada - Germany APA                        
Income Taxes Disclosure [Line Items]                        
U.S.-Canada Advance Pricing Agreement, description                   During the third quarter of 2017, Kronos’ Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (the “Canada-Germany APA”) effective for tax years 2005 - 2017. Pursuant to the terms of the Canada-Germany APA, the Canadian and German tax authorities agreed to certain prior year changes to taxable income of our Canadian and German subsidiaries.    
Non-cash income tax benefit related to reversal of reserve for uncertain tax positions           $ 8.1       $ 8.6    
Canada - Germany APA | Earliest Tax Year                        
Income Taxes Disclosure [Line Items]                        
Effective tax year                   2005    
Canada - Germany APA | Latest Tax Year                        
Income Taxes Disclosure [Line Items]                        
Effective tax year                   2017    
IRS                        
Income Taxes Disclosure [Line Items]                        
Current cash income tax expense for GILTI                   $ 4.0 1.8  
Contran                        
Income Taxes Disclosure [Line Items]                        
Income taxes payable noncurrent   4.0               4.0 10.0  
Income taxes payable current   56.3               $ 56.3 $ 56.3  
Expected Future Periods Net Operating Loss Utilization | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance             $ (149.9)          
Effect of Currency Exchange Rates                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance                       13.7
Transition Tax | Maximum                        
Income Taxes Disclosure [Line Items]                        
Percentage of annual usage limitation on net operating loss carryforward                   80.00%    
Germany                        
Income Taxes Disclosure [Line Items]                        
Deferred income tax benefit from change in enacted tax rate   4.7                    
Income tax expense (benefit)   3.0                    
Current income taxes expense (benefit)   1.5                    
Deferred income taxes expense (benefit)   1.5                    
Germany | Expected Future Periods Net Operating Loss Utilization | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance             (141.9)          
Belgium | Expected Future Periods Net Operating Loss Utilization | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance             $ (8.0)          
Germany and Belgian                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance                       $ (186.7)
Germany and Belgian | Current Periods Net Operating Loss Utilization                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance               $ (24.1) $ (12.7)      
One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Valuation Allowance of Deferred Tax Assets | Non Cash Deferred Income Tax Benefit                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance         $ (18.7)              
Kronos Worldwide, Inc. | Expected Future Periods Net Operating Loss Utilization                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance $ (173.0)                      
Kronos Worldwide, Inc. | Germany | Expected Future Periods Net Operating Loss Utilization                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance (153.0)                      
Kronos Worldwide, Inc. | Belgium | Expected Future Periods Net Operating Loss Utilization                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance $ (20.0)                      
Kronos Worldwide, Inc. | Germany and Belgian | Current Periods Net Operating Loss Utilization                        
Income Taxes Disclosure [Line Items]                        
Increase (decrease) in non-cash deferred income tax asset valuation allowance                 $ (12.7)      
European Subsidiaries | Transition Tax | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Current income tax expense provisional pursuant to transition tax         76.2              
Income tax liability payable period                   8 years 8 years 8 years
Income tax expense (benefit)     2.1                  
Payable to affiliate   62.2               $ 62.2 $ 62.2  
European Subsidiaries | Transition Tax | Chemicals | Contran                        
Income Taxes Disclosure [Line Items]                        
Income taxes payable noncurrent   56.3               56.3 56.3  
Income taxes payable current   5.9               5.9 5.9  
European Subsidiaries | Transition Tax | Chemicals | Income Tax Payable | Contran                        
Income Taxes Disclosure [Line Items]                        
Current income tax expense payable in increments over remainder of eight year period   62.2               62.2 62.2  
European and Canadian Subsidiaries | Undistributed Earnings Previously Considered to be Permanently Reinvested | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Aggregate provisional non-cash deferred income tax expense         $ 5.3           1.8  
Corporate Tax Purposes | Kronos Worldwide, Inc. | Germany | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Net operating loss carryforwards   501.0               501.0    
Corporate Tax Purposes | Kronos Worldwide, Inc. | Belgium | Chemicals                        
Income Taxes Disclosure [Line Items]                        
Net operating loss carryforwards   8.0               8.0    
Canada Revenue Agency and German Federal Central Tax Office | Germany | Canada - Germany APA                        
Income Taxes Disclosure [Line Items]                        
Non-cash income tax benefit related to increase in German NOLs           2.6            
Cash tax refund           $ 0.6            
Direct Investment in Subsidiary | Kronos Worldwide, Inc.                        
Income Taxes Disclosure [Line Items]                        
Deferred income taxes expense (benefit)     $ (112.0)             0.1 $ 4.9 $ 22.1
Deferred income tax liability   37.8               37.8    
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum                        
Income Taxes Disclosure [Line Items]                        
Deferred income tax liability   $ 155.4               $ 155.4