Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 35
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Name:	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Financial Instruments Financial Instruments - Foreign Currency Exchange Rate Risk and Concentration of Credit Risk (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Entity	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Concentration Risk, Percentage	99.00%
Sales Revenue, Goods, Net [Member]
Derivative [Line Items]
Concentration Risk, Percentage	23.00%	23.70%	27.20%
Number of customers \| Entity	3
Accounts Receivable [Member]
Derivative [Line Items]
Concentration Risk, Percentage	5.50%	6.20%
Accumulated Translation Adjustment [Member]
Derivative [Line Items]
Foreign currency (losses) gains of net investment hedges included in accumulated other comprehensive loss \| $	$ 16.6	$ (46.1)	$ 7.6