Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 30, 2018	Dec. 28, 2018	Dec. 29, 2017	Apr. 03, 2015	Dec. 28, 2018	Dec. 29, 2017		Dec. 30, 2016		Mar. 07, 2018	Jan. 31, 2018	Jan. 01, 2016
Operating Loss Carryforwards [Line Items]
Provisional net income tax expense					$ (5.3)	$ 129.7	[1]	$ 43.9	[1]
Foreign Earnings Repatriated					609.3
Unrecognized Tax Benefits		$ 69.1	$ 82.4		69.1	82.4		$ 72.9				$ 59.0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		60.5	68.5		60.5	68.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		11.0	12.7		$ 11.0	$ 12.7
Statutory federal income tax rate					21.00%	35.00%		35.00%
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		86.8			$ 86.8
Operating Loss Carryforwards, Expiration Date					Jan. 01, 2021
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		83.8			$ 83.8
Tax Cuts and Jobs Act 2017
Operating Loss Carryforwards [Line Items]
Provisional net income tax expense			$ 80.2
One-time deferred income tax benefit to record GILTI deferred taxes		15.1
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount		6.0			$ 6.0
Tax Credit Carryforward, Expiration Date					Jan. 01, 2026
Research Tax Credit Carryforward [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount		$ 22.4			$ 22.4
Tax Year 2010 and 2011 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Notice of Proposed Adjustments - Tax and Penalties				$ 67.0
Loss Contingency Accrual, Payments	$ 8.6
Loss Contingency Accrual											$ 15.8
Income Tax Examination, Penalties and Interest Accrued										$ 51.2

[1] See Note 2 for a summary of adjustments