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. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 25.2	$ 0.0	$ 49.2	$ 52.9
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	14.6	0.0	35.2	34.6
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 10.6	$ 0.0	$ 14.0	$ 18.3