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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Holiday [Line Items]
Provisional income tax expense									$ 0.5	$ 317.8	$ 0.0
Estimated cumulative undistributed foreign earnings										1,600.0
U.S. tax on foreign earnings									43.7	8.4	5.0
Excess tax benefits associated with employee equity plans	$ 15.8	$ 24.1	$ 21.6	$ 54.7	$ 19.9	$ 19.7	$ 30.6	$ 32.6	116.2	102.8	0.0
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit)										47.6
Valuation allowance	42.3				29.4				42.3	29.4
Unrecognized tax benefits, period increase (decrease)									13.4
Total gross unrecognized tax benefits	78.8				65.4				78.8	65.4	106.0	$ 92.4
Interest and penalties related to unrecognized tax benefits accrued	$ 2.6				$ 1.8				$ 2.6	1.8	3.7
Swiss Federal Tax Administration (FTA)
Income Tax Holiday [Line Items]
Tax benefit from tax holiday										$ 10.9	$ 10.0
Tax benefit from tax holiday (in dollars per share)										$ 0.09	$ 0.08
Pro forma
Income Tax Holiday [Line Items]
U.S. tax on foreign earnings										$ 270.2

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Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, 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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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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