Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Total revenue	$ 350.0	$ 355.2	$ 677.0	$ 710.9
Cost of sales	246.9	245.4	473.8	493.1
Gross margin	$ 103.1	$ 109.8	$ 203.2	$ 217.8
Gross margin %	29.50%	30.90%	30.00%	30.60%
Operating expenses:
Research and development	$ 41.6	$ 42.3	$ 81.7	$ 84.0
Selling, general and administrative	47.7	57.8	96.3	110.5
Amortization of acquisition-related intangibles	1.9	2.1	3.8	4.2
Restructuring, impairments, and other costs	0.6	4.2	(10.3)	8.9
Charge for litigation	0.5		0.5
Goodwill impairment charge				0.6
Total operating expenses	92.3	106.4	172.0	208.2
Operating income	10.8	3.4	31.2	9.6
Other expense, net	1.2	1.6	2.8	2.8
Income before income taxes	9.6	1.8	28.4	6.8
Provision for income taxes	2.7	2.7	6.7	6.6
Net income (loss)	$ 6.9	$ (0.9)	$ 21.7	$ 0.2
Net income (loss) per common share:
Basic	$ 0.06	$ (0.01)	$ 0.19
Diluted	$ 0.06	$ (0.01)	$ 0.19
Weighted average common shares:
Basic	114.7	116.1	114.3	116.7
Diluted	116.4	116.1	116.5	119.2