Restructuring and Related Costs (Reconciliation Of Expenses By Type) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.3	$ 1.2
Restructuring-related costs	1.1	0.0
Total restructuring and restructuring-related costs	1.4	1.2
Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.2	0.2
Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.1	0.2
Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.8
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	0.3	0.3
Restructuring-related costs	0.5	0.0
Total restructuring and restructuring-related costs	0.8	0.3
Cost of Sales | Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.2	0.2
Cost of Sales | Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.1	0.1
Cost of Sales | Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.0
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	0.0	0.9
Restructuring-related costs	0.6	0.0
Total restructuring and restructuring-related costs	0.6	0.9
Operating Expense | Employee termination expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.0
Operating Expense | Facility related costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.1
Operating Expense | Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.8
Operating Expense | Other employment benefit expenses
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 0.6	$ 0.0