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Fair Value Measurements (Narrative) (Details) - Senior Notes Due 2021 [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 30, 2017
Jun. 02, 2011
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Stated interest rate     4.75%
Long-term Debt $ 599.6 $ 599.5  
Significant Other Observable Inputs (Level 2)      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Long-term Debt, Fair Value $ 619.7