Other (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016	Dec. 25, 2016	Jun. 26, 2016
Other Expense [Line Items]
Advertising expense	$ 26.6	$ 22.3	$ 86.0	$ 63.6
Severance liability	25.2		25.2		$ 23.2
Capitalized Computer Software Costs
Other Expense [Line Items]
Capitalized computer software amortization	4.0	2.8	9.7	8.5
Headquarters Redesign and Consolidation
Other Expense [Line Items]
Costs incurred during the period	2.5		6.9
Restructuring costs capitalized in period	26.0		37.0
Severance | Selling, General and Administrative Expenses
Other Expense [Line Items]
Severance costs	$ 2.1	13.0	$ 23.0	18.3
Relocation and Severance-related Charges | Streamlining of International Print Operations
Other Expense [Line Items]
Costs incurred to date		$ 2.9		$ 2.9		$ 11.9