Business Combination and Divestitures - Schedule Of Preliminary Consideration (Details) - Mallinckrodt & Endo Merger $ / shares in Units, $ in Millions	Jul. 31, 2025 USD ($) $ / shares shares
Business Acquisition [Line Items]
Share exchange ratio (in shares) | shares	0.2575
Equity interest issued (in shares) | shares	19,650,663
Closing stock price (in dollars per share) | $ / shares	$ 90.50
Other cash consideration	$ 0.0
Payment to Endo stockholders	100.0
Obligation to cash settle shares underlying certain Endo stock-based awards	4.2
Total consideration transferred	1,884.5
Other cash consideration in lieu of fractional shares (less than)	$ 0.1
Endo
Business Acquisition [Line Items]
Common stock outstanding (in shares) | shares	76,313,462