Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Statement of Comprehensive Income [Abstract]
Pension benefit plan, tax expense (benefit)	$ (0.6)	$ (0.3)	$ 1.0
Derivative instruments, tax (benefit) expense			$ (2.5)