Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 29, 2023	Sep. 30, 2022	Sep. 30, 2022	Jun. 16, 2022	Sep. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 256.8	$ 258.8	$ 258.8	$ 276.9	$ 256.8	$ 294.0	$ 272.8
Revenue Reserve Provision			459.8		715.7	1,195.1
Revenue Reserve Payments or Credits			(477.9)		(711.6)	(1,232.3)
Net sales		497.0	$ 550.4	$ 465.4	$ 874.6	1,396.6
Accrued Medicaid		57.2				57.2	89.3
Accrued rebates		$ 35.9				$ 35.9	55.3
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		85.10%	82.60%	82.40%	80.80%	83.10%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		14.90%	17.40%	17.60%	19.20%	16.90%
Royalty [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 0.2	$ 21.2	$ 18.2	$ 34.9	$ 4.0
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	[1]	230.7	218.1	218.1	250.6	230.7	265.3	241.8
Revenue Reserve Provision	[1]		429.9		693.4	1,150.5
Revenue Reserve Payments or Credits	[1]		(462.4)		(684.6)	(1,185.1)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		13.3	17.4	17.4	18.6	13.3	16.0	21.5
Revenue Reserve Provision			3.1		5.2	8.5
Revenue Reserve Payments or Credits			(4.3)		(8.1)	(11.2)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 12.8	23.3	$ 23.3	7.7	12.8	$ 12.7	$ 9.5
Revenue Reserve Provision			26.8		17.1	36.1
Revenue Reserve Payments or Credits			$ (11.2)		$ (18.9)	$ (36.0)

[1] Includes $57.2 million and $89.3 million of accrued Medicaid and $35.9 million and $55.3 million of accrued rebates as of September 29, 2023 (Successor) and December 30, 2022 (Successor), respectively, included within accrued and other current liabilities in the unaudited condensed consolidated balance sheets.