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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended				12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Holiday [Line Items]
Federal statutory tax rate						35.00%	35.00%	35.00%
Provisional income tax expense						$ 317.8	$ 0.0	$ 0.0
Repatriation toll charge payable period						8 years
Provisional estimate of income tax expense related to the 2017 Tax Act		$ 317.8	$ 0.0	$ 0.0	$ 0.0	$ 47.6
Excess tax benefits associated with employee equity plans		19.9	$ 19.7	$ 30.6	$ 32.6	$ 102.8	0.0	0.0
Excess tax benefits related to share-based compensation arrangements, percent reduction						9.40%
Income Tax Holiday, Termination Period						5 years
Valuation allowance		29.4				$ 29.4	17.2
Unrecognized tax benefits, period increase (decrease)						40.6
Total gross unrecognized tax benefits		65.4				65.4	106.0	92.4	$ 75.5
Interest and penalties related to unrecognized tax benefits accrued		$ 1.8				1.8	$ 3.7	$ 2.9
Swiss Federal Tax Administration (FTA)
Income Tax Holiday [Line Items]
Tax benefit from tax holiday						$ 10.9
Tax benefit from tax holiday (in dollars per share)						$ 0.09
Scenario, forecast
Income Tax Holiday [Line Items]
Federal statutory tax rate	21.00%
Pro forma
Income Tax Holiday [Line Items]
Estimated cumulative undistributed foreign earnings						$ 1,873.8
Provisional estimate of income tax expense related to repatriation toll						$ 270.2

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Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act of 2017, Amount

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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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The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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