Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Jul. 01, 2022	Jun. 30, 2023	Jun. 16, 2022	Jun. 30, 2023	Jun. 16, 2022	Dec. 30, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue Reserves		$ 263.4	$ 264.5	$ 276.9	$ 264.5	$ 276.9	$ 294.0	$ 272.8
Revenue Reserve Provision		70.5			752.8	715.7
Revenue Reserve Payments or Credits		(84.0)			(782.3)	(711.6)
Net sales		$ 85.0	475.0	$ 383.7	899.6	$ 874.6
Accrued Medicaid			91.3		91.3		89.3
Accrued rebates			$ 36.4		$ 36.4		55.3
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		83.80%	83.60%	82.40%	82.00%	80.80%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue		16.20%	16.40%	17.60%	18.00%	19.20%
Royalty [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 3.0	$ 0.4	$ 14.9	$ 3.8	$ 34.9
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	[1]	237.7	243.0	250.6	243.0	250.6	265.3	241.8
Revenue Reserve Provision	[1]	68.5			726.0	693.4
Revenue Reserve Payments or Credits	[1]	(81.4)			(748.3)	(684.6)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		18.4	13.2	18.6	13.2	18.6	16.0	21.5
Revenue Reserve Provision		0.5			5.8	5.2
Revenue Reserve Payments or Credits		(0.7)			(8.6)	(8.1)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves		7.3	$ 8.3	$ 7.7	8.3	7.7	$ 12.7	$ 9.5
Revenue Reserve Provision		1.5			21.0	17.1
Revenue Reserve Payments or Credits		$ (1.9)			$ (25.4)	$ (18.9)

[1] Includes $91.3 million and $89.3 million of accrued Medicaid and $36.4 million and $55.3 million of accrued rebates as of June 30, 2023 (Successor) and December 30, 2022 (Successor), respectively, included within accrued and other current liabilities in the unaudited condensed consolidated balance sheets.