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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% |  |  |  |

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