Leases - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 25, 2022	Sep. 26, 2021
Leases [Abstract]
Amortization of right of use assets - finance leases	$ 0.8	$ 0.6	$ 2.1	$ 1.7
Interest on lease liabilities - finance leases	0.8	0.7	2.2	2.0
Operating lease cost	3.1	2.6	9.7	8.3
Short-term lease cost	0.2	0.2	0.6	0.6
Variable lease cost (cost excluded from lease payments)	0.0	0.0	0.1	0.1
Sublease income	0.0	0.0	0.0	(0.1)
Total lease cost	$ 4.9	$ 4.1	$ 14.7	$ 12.6