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Fair Value Measurements Fair Value Disclosures (Details) - USD ($)
$ in Millions
Sep. 28, 2019
Dec. 29, 2018
Sep. 29, 2018
Fair Value Disclosures [Abstract]      
Debt, Carrying Value $ 934.0 $ 570.1 $ 662.1
Debt, Fair Value $ 952.8 $ 566.8 $ 668.7