Pension Plans and Postretirement Benefits (Postretirement Benefit cost (income)) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) expense	$ (3.0)	$ 2.0	$ 1.7
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	0.0	0.0	0.0
Interest cost on projected benefit obligation	0.5	0.5	0.6
Amortization of prior service cost	0.0	0.0	(0.2)
Amortization of actuarial gain	(0.4)	(0.2)	(0.5)
Net periodic benefit (income) expense	$ 0.1	$ 0.3	$ (0.1)