Restructuring - Restructuring Related Costs Included in Selling, General & Administrative expenses on Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 26, 2015	Sep. 30, 2016	Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 7.3	$ 7.2	$ 19.9	$ 17.6
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7.3	6.8	19.2	13.8
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ 0.4	$ 0.7	$ 3.8