Postretirement Plans - Summary of Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 20.3	$ 21.1	$ 19.1
Interest cost	51.4	52.0	53.9
Expected return on plan assets	(70.5)	(66.6)	(58.7)
Net periodic benefit cost	41.9	55.9	46.5
Net gain	85.0	7.6	(61.1)
U.S. Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.2	0.2
Interest cost	2.2	2.6	3.3
Expected return on plan assets	(1.1)	(1.0)	(1.0)
Net periodic benefit cost	1.2	1.8	2.5
Net gain	$ (3.4)	$ (1.2)	$ (3.0)