Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023	Dec. 29, 2023	Dec. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 249.8	$ 264.5	$ 249.8	$ 264.5	$ 227.4	$ 294.0
Revenue Reserve Provision				869.2	752.8
Revenue Reserve Payments or Credits				(846.8)	(782.3)
Net sales		514.3	$ 475.0	982.1	$ 899.6
Accrued Medicaid		35.4		35.4		59.0
Accrued rebates		$ 36.8		$ 36.8		35.1
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		86.90%	83.60%	85.80%	82.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		13.10%	16.40%	14.20%	18.00%
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	[1]	$ 223.3	$ 243.0	$ 223.3	$ 243.0	201.6	265.3
Revenue Reserve Provision	[1]			832.7	726.0
Revenue Reserve Payments or Credits	[1]			(811.0)	(748.3)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		15.9	13.2	15.9	13.2	14.5	16.0
Revenue Reserve Provision				11.0	5.8
Revenue Reserve Payments or Credits				(9.6)	(8.6)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 10.6	$ 8.3	10.6	8.3	$ 11.3	$ 12.7
Revenue Reserve Provision				25.5	21.0
Revenue Reserve Payments or Credits				$ (26.2)	$ (25.4)

[1] Includes $35.4 million and $59.0 million of accrued Medicaid and $36.8 million and $35.1 million of accrued rebates as of June 28, 2024 (Successor) and December 29, 2023 (Successor), respectively, included within accrued and other current liabilities in the unaudited condensed consolidated balance sheets.