Income Taxes - Components of Income Taxes (Details) - USD ($) $ 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
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Domestic									$ (61.8)	$ (54.2)	$ (78.8)
Foreign									9.5	9.6	7.0
Loss from continuing operations before income taxes									(52.3)	(44.6)	(71.8)
Federal income taxes:
Current									(0.5)	(15.7)	0.0
Deferred									4.0	1.4	2.9
Total Federal									3.5	(14.3)	2.9
State and local income taxes
Current									2.3	0.8	1.6
Deferred									0.7	0.0	(1.7)
Total State and local									3.0	0.8	(0.1)
Foreign income taxes:
Current									1.5	1.2	0.7
Deferred									0.1	0.9	0.4
Total Foreign									1.6	2.1	1.1
Total	$ 0.8	$ 1.9	$ 1.8	$ 3.6	$ (0.3)	$ (15.3)	$ 2.3	$ 1.9	$ 8.1	$ (11.4)	$ 3.9