Segment Data - Schedule of Net Sales from External Customers by Products (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 27, 2025	Jun. 30, 2026	Jun. 27, 2025
Segment Reporting
Net sales	$ 517.2	$ 264.3	$ 985.5	$ 471.5
Single Reportable Segment
Segment Reporting
Net sales	517.2	264.3	985.5	471.5
Acthar Gel \| Single Reportable Segment
Segment Reporting
Net sales	204.7	175.1	374.2	290.5
Xiaflex \| Single Reportable Segment
Segment Reporting
Net sales	149.8	0.0	284.2	0.0
INOmax \| Single Reportable Segment
Segment Reporting
Net sales	58.9	61.9	117.7	124.4
Other Products \| Single Reportable Segment
Segment Reporting
Net sales	94.2	27.2	193.9	56.3
License Revenue \| Single Reportable Segment
Segment Reporting
Net sales	$ 9.6	$ 0.1	$ 15.5	$ 0.3

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details