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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - Fixed rate Senior Notes due 2021 - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 26, 2015
Jun. 02, 2011
Fair Value of Financial Instruments [Line Items]      
Stated interest rate     4.75%
Long-term Debt $ 599.4 $ 599.3  
Significant Other Observable Inputs (Level 2)      
Fair Value of Financial Instruments [Line Items]      
Long-term Debt, Fair Value $ 640.8