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Fair Value Measurements Fair Value Disclosures (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Fair Value Disclosures [Abstract]      
Debt, Carrying Value $ 671.9 $ 782.1 $ 812.6
Debt, Fair Value $ 681.4 $ 802.5 $ 816.6