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Income Taxes Significant Differences Between U.S. Federal Statutory Rate and Effective Income Tax Rate Footnote (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 12, 2015
Schedule Of Effective Tax Rates Line Items          
Foreign earnings repatriated   $ 42.5 $ 308.4 $ 1,400.0  
Repatriation of foreign earnings   $ 9.1 $ 67.5 $ 350.2  
Foreign income tax rate differential   13.50% 19.30% 22.00%  
Provisional tax benefit related to remeasurement of deferred tax balances   $ 62.3      
Reduction in federal statutory rate   35.00% 35.00% 35.00%  
Provisional tax expense related to transition tax on foreign earnings   $ 429.2      
Net benefit from release of tax reserves       $ 42.7  
Jordan Bromine Company Limited          
Schedule Of Effective Tax Rates Line Items          
Foreign income tax rate differential   8.90% 7.30% 8.20%  
Rockwood Holdings, Inc.          
Schedule Of Effective Tax Rates Line Items          
Foreign earnings repatriated       $ 111.0  
Repatriation of foreign earnings       327.9  
Undistributed earnings of foreign subsidiaries         $ 387.0
Reversal of deferred tax liability, undistributed foreign earnings, impact on earnings       356.2  
Reversal of deferred tax liability, undistributed foreign earnings, foreign exchange       $ 30.8  
Subsequent Event          
Schedule Of Effective Tax Rates Line Items          
Reduction in federal statutory rate 21.00%