Commitments and Contingencies - Additional Information (Details) $ in Millions		1 Months Ended			2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 12, 2025 USD ($)	Apr. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	May 31, 2007 defendant	Sep. 26, 2025 USD ($)	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($)	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($)	Jun. 27, 2025 USD ($)	Mar. 28, 2025 USD ($)	Dec. 27, 2024 USD ($)	Sep. 30, 2022 USD ($)	Sep. 09, 2022 USD ($)	Sep. 28, 2021 USD ($)	Aug. 31, 2018 USD ($)	Mar. 31, 2016 USD ($)	Apr. 30, 2014 USD ($)
Loss Contingencies [Line Items]
Government facility access term								10 years
Qualifying cost reimbursement term (in years)					30 days	30 days		30 days
Percent of capital expenditures under agreement to date								0.9
Environmental liabilities					$ 35.6	$ 35.6		$ 35.6
Environmental liabilities, current					1.0	1.0		1.0
Selling, general and administrative expenses						351.7	$ 141.2	649.8	$ 406.0
Contractual obligation contingent consideration					0.0
U.S. Government Cooperative Agreement
Loss Contingencies [Line Items]
Selling, general and administrative expenses					0.3
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss																	$ 1,380.0	$ 1,700.0
Loss contingency, settlement agreement, amount													$ 0.3			$ 0.3
Upper 9 Miles, Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss					21.2	21.2		21.2							$ 441.0
Legal contingency, cost reopener														$ 3,700.0
Minimum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss					17.0	17.0		17.0
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss																		365.0
Maximum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss					51.5	51.5		51.5
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss																		$ 3,200.0
Mallinckrodt Pharmaceuticals Ireland Limited v.s. Airgas Therapeutics LLC | Pending Litigation
Loss Contingencies [Line Items]
Damages awarded	$ 9.5
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Loss contingency, number of defendants | defendant				70
Continental General | Settled Litigation
Loss Contingencies [Line Items]
Litigation settlement, loss		$ 5.5
Loss contingency accrual											$ 4.4
Loss contingency, receivable											$ 0.5
Stougo Matter | Settled Litigation
Loss Contingencies [Line Items]
Litigation settlement, loss			$ 46.0
Loss contingency accrual										$ 46.0		$ 46.0
Endo Bankruptcy | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency accrual					$ 8.4	$ 8.4		$ 8.4
Year one												25.0
Year two												25.0
Year three												25.0
Year four												25.0
Year five												25.0
Endo Bankruptcy | Pending Litigation | Maximum
Loss Contingencies [Line Items]
Contractual obligation												$ 100.0