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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Contract related intangible asset impairment               $ 5.1   $ 5.1  
Business interruption insurance proceeds         $ 0.9   $ 1.4 $ 2.0   4.3  
Current Income Tax Expense (Benefit)                 $ 125.8 45.0 $ 18.4
Deferred income taxes expense (benefit)                 (245.8) (26.4) 89.1
Non-cash income tax expense related to uncertain tax positions         7.2            
Loss on prepayment of debt   $ 7.1             7.1    
Current income tax expense provisional pursuant to transition tax $ 76.2               76.2    
Deferred income tax benefit from change in enacted tax rate                 77.1    
Valuation allowance                 (205.4) (2.2) $ 159.0
Waste Management                      
Out of period adjustment to transaction costs related to proposed sale         4.3            
Out of period adjustment to transaction costs net of tax related to proposed sale         2.7            
Canada - Germany APA                      
Non-cash income tax expense related to uncertain tax positions   8.1             $ 8.6    
U.S. – Canada APA   (11.8)                  
Kronos Worldwide, Inc. | US-Canada APA                      
Current Income Tax Expense (Benefit)         2.2 $ (5.6)          
U.S. – Canada APA                   $ (3.4)  
Non Cash Deferred Income Tax Benefit | Deferred Income Tax Liability | U.S. Federal Corporate Income Tax Rate                      
Deferred income tax benefit from change in enacted tax rate 77.1                    
Aggregate provisional non-cash deferred income tax expense (benefit) 5.3                    
Valuation Allowance of Deferred Tax Assets | One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit                      
Valuation allowance (18.7)                    
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | Germany and Belgium | Current Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit                      
Deferred income taxes expense (benefit)         $ (4.3) $ (0.8) $ 2.9        
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | Germany and Belgium | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit                      
Deferred income taxes expense (benefit) (16.3) $ (7.8)   $ (5.0)              
Kronos Worldwide, Inc. | Valuation Allowance of Deferred Tax Assets | One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Non Cash Deferred Income Tax Benefit                      
Deferred income taxes expense (benefit)     $ 157.6                
Valuation allowance $ (18.7)