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Fair Value Measurements Recurring Fair Value Measurements (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset $ 3.2 $ 0.3 $ 3.5
Derivative Liability $ (22.1) $ (19.1) $ (4.9)