Other - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 30, 2018
Other Expense [Line Items]
Advertising expense	$ 36.6	$ 35.6	$ 84.1	$ 67.2
Severance liability	6.0		6.0		$ 8.4
Capitalized Computer Software Costs
Other Expense [Line Items]
Capitalized computer software amortization	4.4	3.9	8.7	7.3
Headquarters Redesign and Consolidation
Other Expense [Line Items]
Costs incurred during the period		1.3		3.1
Restructuring costs capitalized in period		5.0	1.0	11.0
Severance | Selling, General and Administrative Expenses
Other Expense [Line Items]
Severance costs	$ 0.7	$ 2.2	$ 2.1	$ 4.6