Segment Reporting - Revenues by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Schedule Of Revenues From External Customers [Line Items]
Total	$ 779.8	$ 549.2	$ 1,489.6	$ 1,024.3
Total	779.8	549.2	1,489.6	1,024.3
United States [Member]
Schedule Of Revenues From External Customers [Line Items]
Total	311.1	327.9	608.3	638.7
Total	$ 311.1	$ 327.9	$ 608.3	$ 638.7