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Income Taxes - Additional information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017	Dec. 31, 2014
Income Taxes [Line Items]
Unrecognized net operating loss carryforwards, foreign	$ 11.5	$ 5.4	$ 1.7
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
Foreign jurisdictions income with tax holidays	$ 124.1	$ 89.7	$ 72.2
Valuation allowance for deferred tax assets	402.2	445.6
Net increase (decrease) in valuation allowance	(43.4)
Tax loss carryforwards	1,900.0
Tax loss carryforwards with no expiration date	1,500.0
Tax loss carryforwards with expiration date	342.0
Tax credit carryforwards	341.0
Tax benefits related to share-based payment awards, increase in long-term deferred tax assets	555.4	459.4
Cumulative effect of adoption of ASU 2016-09		52.9
Unrecognized tax benefits	33.2	29.5	$ 30.4		$ 39.7
Unrecognized tax benefits, interest and penalties	9.9	$ 7.8
Decrease in unrecognized tax benefits, reasonably possible during the next twelve months	2.2
U.S.
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	20.9
International jurisdictions
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	$ 381.3
Accounting Standards Update 2016-09
Income Taxes [Line Items]
Tax benefits related to share-based payment awards, increase in long-term deferred tax assets				$ 52.9

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Income Taxes [Line Items]

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The Component of income tax benefit representing unrecognized net operating loss carryforwards, foreign.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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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 income exempt from income tax because of a tax holiday.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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