Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Effective tax rate	14.80%		18.80%	13.60%	14.70%
U.S. statutory federal tax rate				21.00%		35.00%
Discrete tax expense	$ 0.2		$ 0.3	$ 2.4
Discrete tax benefits				6.5	$ 6.1
Discrete tax benefits, non-taxable foregn exchange gain (loss)	(1.1)		(0.8)		1.1
Discrete tax benefit, Other	0.4			0.6
Discrete tax benefits, net				8.9
Discrete tax benefits, stock based compensation			0.2	7.8	6.7
Discrete tax expense, remeasurement of deferred tax assets				1.7
Discrete tax expenses, Other				0.7
Discrete tax benefits, U.S research and development tax credits					0.7
Discrete tax expense, actuarial gains					1.0
Uncertain tax positions	38.6	$ 36.3		38.6		$ 36.3
Net Increase in uncertain tax positions				2.3
Accrued interest and penalties	0.3	0.3		0.3		$ 0.3
Interest and penalties related to income tax, expense (benefit)				0.1	0.1
Tax savings due to the tax holiday				$ 8.9	$ 20.5
Tax savings due to the tax holiday, per share				$ 0.05	$ 0.10
Tax holiday expiration date				December 31, 2020
Provisional amount of additional income tax expense		186.0
Transition tax on mandatory deemed repatriation of foreign earnings		161.0
Expense related to remeasurement of deferred tax assets and liabilities		33.6
Benefit associated with impact of correlative adjustments on tax positions		10.3
Expense related to remeasurement of certain deferred		$ 1.7
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Discrete tax offset amount	$ 0.5		$ 0.2	$ 0.5	$ 0.5