Stock-Based Compensation (Expense Included in Selling, General and Administrative Expenses Related to Stock Options and Restricted Stock Awards) (Details) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation Expense	$ 2.7	$ 2.3	$ 6.4	$ 5.5
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation Expense	1.0	1.3	2.2	2.8
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation Expense	1.7	1.0	3.5	2.0
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation Expense	$ 0.0	$ 0.0	$ 0.7	$ 0.7