Segment Reporting - Revenues by Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 709.8	$ 475.1
Total	709.8	475.1
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	297.2	310.7
Total	$ 297.2	$ 310.7