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Business and Summary of Significant Accounting Policies (Property & Equipment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Jan. 02, 2018
Property, Plant and Equipment [Line Items]      
Depreciation $ 22.0 $ 22.7 $ 24.5
Internal payroll costs capitalized 0.4 0.2 0.9
Interest costs capitalized $ 0.3 $ 0.1 $ 0.2
Leasehold Improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 20 years    
Furniture and Fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 15 years    
Furniture and Fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 7 years    
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years