Schedule Of Effective Tax Rates Line Items

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Tax Cuts And Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit)

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Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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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