Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 28, 2019	Dec. 30, 2018	Dec. 31, 2017	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Transition tax			$ 26.2
Tax benefit due to remeasurement of deferred tax assets and liabilities			21.5
Estimated impact of Tax Act			4.7
Measurement period adjustments to provisional tax benefit		$ 0.8
Transition tax payable		12.0			$ 12.0
Payments for transition tax	$ 12.0
Income from domestic operations included in income from continuing operations before income taxes				$ 295.9	243.7	$ 187.2
Income from foreign operations included in income before taxes				177.8	150.2	99.8
Undistributed foreign earnings				309.5
Estimated deferred tax liability, undistributed foreign earnings				1.4
Increase (decrease) in valuation allowance				0.7
Expected decrease in unrecognized tax benefits over next 12 months				3.4
Interest related to unrecognized tax benefit				0.3	(0.3)	0.5
Interest accrued for unrecognized tax benefits		$ 1.7	$ 1.4	1.1	$ 1.7	$ 1.4
Denmark
Income Tax Contingency [Line Items]
Operating loss carryforwards				43.6
Denmark | Capital Loss Carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards				2.1
Canada | Investment tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration				8.6
Domestic Federal and State
Income Tax Contingency [Line Items]
Operating loss carryforwards subject to expiration				3.8
Domestic State
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration				0.8
Operating loss carryforwards subject to expiration				105.6
Tax credit carryforwards not subject to expiration				9.7
Domestic State | Research tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards				10.6
Federal Tax Authority | Research tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards				$ 0.9