Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 235.7	$ 226.4	$ 235.2	$ 253.3	$ 263.6	$ 276.3	$ 219.8	$ 209.5	$ 950.6	$ 969.2	$ 713.9
Gross profit	61.5	52.3	60.4	65.8	68.0	74.1	57.7	57.4	240.0	257.2	191.2
Total operating income (loss) from continuing operations	5.4	6.1	8.9	11.4	(80.3)	14.1	7.4	9.1	31.8	(49.7)	29.5
Provision (benefit) for income taxes from continuing operations	(2.9)	0.2	(0.1)	2.8	(5.4)	1.3	6.6	(4.1)	0	(1.6)	1.9
Net income (loss)	(7.4)	(9.9)	(9.6)	(10.3)	(90.0)	(4.2)	(17.2)	(3.0)	(37.2)	(114.4)	(24.2)
Basic and diluted loss per common share:
Basic and diluted (in dollars per share)	$ (0.12)	$ (0.17)	$ (0.17)	$ (0.18)	$ (1.59)	$ (0.07)	$ (0.41)	$ (0.09)	$ (0.65)	$ (2.44)	$ (0.88)
Quarterly Financial Data
Impairment of goodwill and intangible assets									0	96.6	0
Expense (benefit) related to acquisitions					2.7	(0.3)	(1.5)	(0.9)	2.0
Amortization of purchased intangibles	8.9	9.0	9.0	9.3	11.5	13.0	8.9	10.5	36.2	43.9	38.0
Reduction in excess facility accrual		4.7							4.7	(1.8)	0
Expense related to workforce reductions		$ 2.0