Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Operating:
Operating lease cost	$ 21.0	$ 22.8	$ 25.8
Short-term lease cost	2.0	2.4	2.6
Variable lease cost	6.1	5.2	5.7
Financing:
Amortization of ROU assets	0.6	0.6	1.4
Interest on lease liabilities	0.0	0.1	0.2
Total lease cost	$ 29.7	$ 31.1	$ 35.7