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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Income Tax Examination [Line Items]      
Tax Cuts and Jobs Act of 2017, reduction in deferred tax asset $ 184.8    
Tax Cuts and Jobs Act of 2017, change in valuation allowance 184.8    
Valuation allowance increase (decrease) (210.1) $ 92.7 $ 7.9
Federal [Member]      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 1,105.0    
Research and development tax credits 83.0    
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 424.0    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]      
Income Tax Examination [Line Items]      
Research and development tax credits $ 28.0