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Details of Foreign Exchange Contracts Pre-Tax Amounts (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Proceeds from Hedge, Investing Activities			$ (62.3)	$ 16.6
Document Period End Date			Sep. 28, 2019
Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Loss on Derivative	$ 0.8	$ 0.8	$ 6.9	2.4
Net Investment Hedging | Foreign Exchange Contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount	385.3		385.3
Proceeds from Hedge, Investing Activities			15.2
Net Investment Hedging | Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount	1,200.0		1,200.0		$ 250.0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts | Other Income And Expense [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 2.0	$ (5.9)	$ 0.7	$ 9.0

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