Other (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2017	Mar. 27, 2016	Dec. 25, 2016
Other Expense [Line Items]
Advertising expense	$ 33.6	$ 21.1
Costs incurred related to redesign of headquarters building	2.4
Severance liability	14.4		$ 23.2
Selling, General and Administrative Expenses
Other Expense [Line Items]
Severance costs	1.6	3.6
Capitalized Computer Software Costs
Other Expense [Line Items]
Capitalized computer software amortization	$ 3.1	$ 3.0