Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Income Tax Contingency [Line Items]
Income from domestic operations included in income from continuing operations before income taxes	$ 221.4	$ 176.7	$ 195.1
Income from foreign operations included in income before taxes	60.7	47.3	33.1
Valuation allowance, deferred tax asset, change in amount	2.8
Foreign tax credit carry forward	3.9
Interest related to unrecognized tax benefit	0.2	2.2
Interest accrued for unrecognized tax benefits	2.9	3.4
Unrecognized tax benefits that would positively impact effective tax rate	31.0
Unrecognized tax benefits	32.3	35.4	42.6	25.8
Unrecognized tax benefits subject to offset by deferred tax assets	1.3
Expected decrease in unrecognized tax benefits over next 12 months	8.7
Undistributed foreign earnings	170.4
Estimated deferred tax liability, undistributed foreign earnings	43.1
Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	63.7
Canada, Federal and Provincial, and U.K.
Income Tax Contingency [Line Items]
Operating loss carryforwards not subject to expiration	59.4
Canada, Federal
Income Tax Contingency [Line Items]
Operating loss carryforwards subject to expiration	4.3
Canada, Federal | Investment tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration	29.8
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards subject to expiration	4.6
Internal Revenue Service (IRS) | Research tax credit carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards subject to expiration	0.8
State Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards	5.6
Operating loss carryforwards subject to expiration	130.0
Tax credit carryforwards subject to expiration	1.9
Tax credit carryforwards	7.8
Tax credit carryforwards not subject to expiration	5.9
State Jurisdiction | Maximum | Reduction in taxes
Income Tax Contingency [Line Items]
Gain contingency, unrecorded Amount	$ 1.0