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Fair Value Measurements Recurring Fair Value Measurements (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset $ 9.2 $ 0.3 $ 0.6
Derivative Liability $ (12.6) $ (19.1) $ (14.7)