Quarterly Financial Data (Unaudited) Summarized Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 182.1	$ 165.4	$ 168.2	$ 153.0	$ 177.5	$ 161.7	$ 160.8	$ 157.1	$ 668.7	$ 657.1	$ 763.0
Gross profit	46.6	25.9	45.2	35.9	42.2	40.4	40.9	38.3	153.6	161.8	179.4
Total operating income (loss) from continuing operations	4.6	(13.0)	0.0	(10.2)	1.5	1.6	(3.7)	(3.9)	(18.6)	(4.5)	5.3
Provision (benefit) for income taxes from continuing operations	0.8	1.9	1.8	3.6	(0.3)	(15.3)	2.3	1.9	8.1	(11.4)	3.9
Income (loss) from continuing operations	(4.4)	(23.5)	(10.3)	(22.2)	(7.0)	4.3	(16.0)	(14.5)
Income (loss) from discontinued operations	0.1	(0.1)	(0.1)	0.0	3.0	50.8	0.9	(1.7)
Net income(loss)	$ (4.3)	$ (23.6)	$ (10.4)	$ (22.2)	$ (4.0)	$ 55.1	$ (15.1)	$ (16.2)	$ (60.5)	$ 19.8	$ (78.0)
Basic income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	$ (0.07)	$ (0.39)	$ (0.17)	$ (0.37)	$ (0.12)	$ 0.07	$ (0.27)	$ (0.25)	$ (0.99)	$ (0.56)	$ (1.31)
Net income (loss) from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.05	0.86	0.02	(0.03)	0.00	0.90	(0.04)
Net income (loss) per common share (in dollars per share)	(0.07)	(0.39)	(0.17)	(0.37)	(0.07)	0.93	(0.25)	(0.28)	(0.99)	0.34	(1.35)
Diluted income (loss) per common share:
Net income (loss) from continuing operations (in dollars per share)	(0.07)	(0.39)	(0.17)	(0.37)	(0.12)	0.07	(0.27)	(0.25)	(0.99)	(0.56)	(1.31)
Net income (loss) from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00	0.05	0.85	0.02	(0.03)	0.00	0.90	(0.04)
Net income (loss) per common share (in dollars per share)	$ (0.07)	$ (0.39)	$ (0.17)	$ (0.37)	$ (0.07)	$ 0.92	$ (0.25)	$ (0.28)	$ (0.99)	$ 0.34	$ (1.35)