Restructuring and Related Costs (Reconciliation Of Expenses By Type) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1.7	$ 2.2	$ 2.0	$ 3.4
Restructuring-related costs			1.1	0.0
Total restructuring and restructuring-related costs	1.7	2.2	3.1	3.4
Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.3	(0.1)	0.5	0.1
Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.8	0.3	0.9	0.5
Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.6	2.0	0.6	2.8
Other employment benefit expenses
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs			1.1	0.0
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.2	2.0	1.5	2.3
Restructuring-related costs			0.5	0.0
Total restructuring and restructuring-related costs			2.0	2.3
Cost of Sales | Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.2	(0.1)	0.4	0.1
Cost of Sales | Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.4	0.3	0.5	0.4
Cost of Sales | Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.6	1.8	0.6	1.8
Cost of Sales | Other employment benefit expenses
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs			0.5	0.0
Operating Expense
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.5	0.2	0.5	1.1
Restructuring-related costs			0.6	0.0
Total restructuring and restructuring-related costs			1.1	1.1
Operating Expense | Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.1	0.0	0.1	0.0
Operating Expense | Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.4	0.0	0.4	0.1
Operating Expense | Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ 0.2	0.0	1.0
Operating Expense | Other employment benefit expenses
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs			$ 0.6	$ 0.0