Details of Foreign Exchange Contracts Pre-Tax Amounts (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Proceeds from Hedge, Investing Activities			$ (23.5)	$ 22.8
Document Period End Date			Jun. 30, 2018
Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Loss on Derivative	$ 0.8	$ 0.8	$ 1.6	1.6
Net Investment Hedging | Foreign Exchange Contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount	701.4		701.4
Proceeds from Hedge, Investing Activities			20.3	3.7
Net Investment Hedging | Foreign Exchange Contracts | Other Income And Expense [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount Recorded in OCI Gain (Loss)		(73.3)		(89.0)
Gain (Loss) Recognized in Income (Ineffective Portion)		$ 0.0		$ 0.0
Net Investment Hedging | Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount	$ 250.0		$ 250.0		$ 250.0