Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023	Dec. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 235.5	$ 256.8	$ 235.5	$ 256.8	$ 227.4	$ 294.0
Revenue Reserve Provision				1,265.7	1,195.1
Revenue Reserve Payments or Credits				(1,257.6)	(1,232.3)
Net sales		505.5	$ 497.0	1,487.6	$ 1,396.6
Accrued Medicaid		29.6		29.6		59.0
Accrued rebates		$ 33.8		$ 33.8		35.1
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		87.10%	85.10%	86.20%	83.10%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		12.90%	14.90%	13.80%	16.90%
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	[1]	$ 200.9	$ 230.7	$ 200.9	$ 230.7	201.6	265.3
Revenue Reserve Provision	[1]			1,206.2	1,150.5
Revenue Reserve Payments or Credits	[1]			(1,206.9)	(1,185.1)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		14.6	13.3	14.6	13.3	14.5	16.0
Revenue Reserve Provision				15.9	8.5
Revenue Reserve Payments or Credits				(15.8)	(11.2)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 20.0	$ 12.8	20.0	12.8	$ 11.3	$ 12.7
Revenue Reserve Provision				43.6	36.1
Revenue Reserve Payments or Credits				$ (34.9)	$ (36.0)

[1] Includes $29.6 million and $59.0 million of accrued Medicaid and $33.8 million and $35.1 million of accrued rebates as of September 27, 2024 (Successor) and December 29, 2023 (Successor), respectively, included within accrued and other current liabilities in the unaudited condensed consolidated balance sheets.