Summary of Significant Accounting Policies - Restructuring Charges and Liability (Details) - 2020 Restructuring Plan $ in Millions	12 Months Ended
	Jan. 02, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at December 28, 2019	$ 0.0
Charges to Costs and Expenses	10.5
Cash Payments	(10.2)
Balance at January 2, 2021	0.3
North America
Restructuring Reserve [Roll Forward]
Balance at December 28, 2019	0.0
Charges to Costs and Expenses	2.7
Cash Payments	(2.7)
Balance at January 2, 2021	0.0
Rest of World
Restructuring Reserve [Roll Forward]
Balance at December 28, 2019	0.0
Charges to Costs and Expenses	7.8
Cash Payments	(7.5)
Balance at January 2, 2021	$ 0.3