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Fair Value Measurements Fair Value Disclosures (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Fair Value Disclosures [Abstract]      
Debt, Carrying Value $ 662.1 $ 782.1 $ 796.2
Debt, Fair Value $ 668.7 $ 802.5 $ 815.2