Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Foreign currency - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intercompany Foreign Currency Balance [Line Items]
Gain (loss) recognized on foreign exchange	$ (10.4)	$ (5.9)	$ (9.9)
Exiting Foreign Countries
Intercompany Foreign Currency Balance [Line Items]
Gain (loss) recognized on foreign exchange			$ (11.8)
Argentina
Intercompany Foreign Currency Balance [Line Items]
Net monetary assets denominated in local currency	$ 6.2