Description of Business and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expenses	$ 384.0	$ 407.0	$ 774.0	$ 796.0
Net loss	$ 49.0	$ 77.0	78.0	$ 102.0
Correction Of Underaccrued Estimations | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating expenses			11.0
Net loss			$ 6.6