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Revenue From Contracts With Customers (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 02, 2021
Apr. 03, 2020
Revenue from Contract with Customer [Abstract]    
Percent of revenue from contract with customer compared to total revenue 35.00% 30.00%
Contract with customer, asset, cumulative catch-up adjustment to revenue, modification of contract $ 4.5  
Revenue recognized that was included in contract liability balance at beginning of period $ 0.9 $ 0.1