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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Effective Tax Rates Line Items |  |  |  |
Foreign income tax rate differential |  | 0.30% | 13.50% | 19.30%
Income tax expense related to remeasurement of deferred tax balances |  | $ (0.4) | $ 62.3 |
Reduction in federal statutory rate | 21.00% | 21.00% | 35.00% | 35.00%
Income tax expense related to transition tax on foreign earnings |  | $ 42.3 | $ 429.2 |
Jordan Bromine Company Limited |  |  |  |
Schedule Of Effective Tax Rates Line Items |  |  |  |
Foreign income tax rate differential |  | 3.30% | 8.90% | 7.30%
Change in valuation allowance, foreign restructuring plan [Member] |  |  |  |
Schedule Of Effective Tax Rates Line Items |  |  |  |
Change in valuation allowance |  | $ 8.2 | $ 10.9 |
Change in valuation allowance, change in expected profitability [Member] |  |  |  |
Schedule Of Effective Tax Rates Line Items |  |  |  |
Change in valuation allowance |  | $ 1.5 |  |

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