Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 29, 2024	Mar. 31, 2023	Dec. 29, 2023	Dec. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 230.8	$ 239.0	$ 227.4	$ 294.0
Revenue Reserve Provision		419.6	368.3
Revenue Reserve Payments or Credits		(416.2)	(423.3)
Net sales		467.8	$ 424.6
Accrued Medicaid		44.7		59.0
Accrued rebates		$ 34.9		35.1
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		84.70%	80.20%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		15.30%	19.80%
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	[1]	$ 205.8	$ 216.6	201.6	265.3
Revenue Reserve Provision	[1]	401.2	355.6
Revenue Reserve Payments or Credits	[1]	(397.0)	(404.3)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		13.0	15.2	14.5	16.0
Revenue Reserve Provision		4.2	3.2
Revenue Reserve Payments or Credits		(5.7)	(4.0)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		12.0	7.2	$ 11.3	$ 12.7
Revenue Reserve Provision		14.2	9.5
Revenue Reserve Payments or Credits		$ (13.5)	$ (15.0)

[1] Includes $44.7 million and $59.0 million of accrued Medicaid and $34.9 million and $35.1 million of accrued rebates as of March 29, 2024 (Successor) and December 29, 2023 (Successor), respectively, included within accrued and other current liabilities in the unaudited condensed consolidated balance sheets.