Fair Value Adjustments Relating to Swaps (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Document Period End Date			Sep. 30, 2017
Proceeds from Derivative Instrument, Financing Activities	$ 0.0	$ 0.0	$ 0.0	$ 27.0
Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Proceeds from Derivative Instrument, Financing Activities		27.0
Interest Expense, Debt				(19.9)
Fair Value Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Interest Expense, Debt		0.0		(3.8)
Foreign Exchange Contract [Member] | Net Investment Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Interest Rate Derivatives	749.6		749.6
Foreign Exchange Contract [Member] | Net Investment Hedging [Member] | Other Income And Expense [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(42.3)	16.0	(131.3)	53.8
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Notes 5 Point 20 Percent Due 2040 [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Stated interest rate	5.20%		5.20%