Accumulated Other Comprehensive Income (Loss) - Components and Activity in Accumulated Other Comprehensive Income (Loss) (Net of Deferred Income Taxes) (Footnotes) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amendment amount of certain U.S. pension and defined contribution plans that were approved by Board of Directors		$ (4.5)
Supplemental Executive Retirement Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Supplemental Employee Retirement plan settlement amount in connection with former CEO and executive chairman		6.5
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Write-offs of foreign currency translation adjustments of phosphorous flame retardants business	17.8	12.3
1.875% Senior Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	12.8
1.875% Senior Notes | Net Investment Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	12.8
Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	5.2
Forward Contracts | Net Investment Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	5.2
Interest Rate Swap | Interest Rate Swap | JP Morgan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	$ (33.4)