Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Income Tax Contingency [Line Items]
Income from domestic operations included in income from continuing operations before income taxes	$ 195.2	$ 213.8	$ 221.4
Income from foreign operations included in income before taxes	46.1	44.4	60.7
Undistributed foreign earnings	226.6
Estimated deferred tax liability, undistributed foreign earnings	59.0
Valuation allowance, deferred tax asset, change in amount	1.9
Expected decrease in unrecognized tax benefits over next 12 months	8.3
Interest related to unrecognized tax benefit	0.2	0.6	0.2
Interest accrued for unrecognized tax benefits	1.9	$ 2.1	$ 2.9
Denmark
Income Tax Contingency [Line Items]
Operating loss carryforwards	49.9
Denmark | Capital Loss Carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards	4.0
Denmark | Foreign Tax Credit
Income Tax Contingency [Line Items]
Tax credit carryforwards	0.4
Canada | Investment tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration	26.1
Domestic Federal and State
Income Tax Contingency [Line Items]
Operating loss carryforwards subject to expiration	5.0
Domestic Federal and State | Research tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration	1.4
Domestic State
Income Tax Contingency [Line Items]
Operating loss carryforwards subject to expiration	112.8
Tax credit carryforwards subject to expiration	1.8
Tax credit carryforwards not subject to expiration	8.1
Domestic State | Research tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards	$ 9.9