Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 28, 2019	Mar. 29, 2019	Jun. 29, 2018	Mar. 30, 2018	Jun. 28, 2019	Nov. 30, 2017
Equity, Class of Stock [Line Items]
Stock Repurchased During Period, Value	$ 19.0	$ 40.0	$ 0.0	$ 50.0
Two Thousand Seventeen Stock Repurchase Program [Member]
Equity, Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	293.2				$ 293.2
Retained Earnings [Member]
Equity, Class of Stock [Line Items]
Stock Repurchased During Period, Value	$ 16.1	$ 33.5	$ 0.0	$ 42.5	$ 49.6
Maximum | Two Thousand Seventeen Stock Repurchase Program [Member]
Equity, Class of Stock [Line Items]
Stock repurchase program approved amount						$ 600.0
Open Market Purchases [Member] | Two Thousand Seventeen Stock Repurchase Program [Member]
Equity, Class of Stock [Line Items]
Stock Repurchased During Period, Shares	0.4				1.4
Accelerated Share Repurchases, Final Price Paid Per Share	$ 42.89				$ 40.60
Stock Repurchased During Period, Value	$ 19.0				$ 59.0