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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule Of Income Tax [Line Items]        
Expected tax expense, at U.S. federal statutory income tax rate of 21% $ 6.6 $ 8.8 $ 15.5 $ 31.2
Incremental net tax on earnings and losses of non-U.S., U.S. and non-tax group companies   4.9 (0.2) 9.0
Non-U.S. tax rates 2.3 7.9 4.6 14.9
Valuation allowance 2.8 1.7 3.8 2.0
Global intangible low-tax income, net 0.4   1.1  
Adjustment to the reserve for uncertain tax positions, net 0.5 0.3 1.0 1.9
U.S. state income taxes and other, net 0.4 (1.6) 1.4 0.6
Income tax expense 13.0 22.0 27.2 58.2
Comprehensive provision for income taxes (benefit) allocable to:        
Income from continuing operations 13.0 22.0 27.2 58.2
Discontinued operations   (0.4)   19.8
Retained earnings – change in accounting principle       1.1
Other comprehensive income (loss):        
Currency translation 0.8 (3.3) 0.8 (1.9)
Total 15.2 19.7 30.9 80.0
Kronos Worldwide, Inc. | Canada-Germany APA        
Schedule Of Income Tax [Line Items]        
Canada – Germany APA       (1.4)
Pension Plans        
Other comprehensive income (loss):        
Defined benefit plans 1.5 1.5 3.1 3.0
OPEB Plans        
Other comprehensive income (loss):        
Defined benefit plans $ (0.1) $ (0.1) $ (0.2) $ (0.2)