Segment Data (Schedule of Net Sales from External Customers by Products) (Details) $ in Millions	3 Months Ended
	Mar. 28, 2025 USD ($) Defendent	Mar. 29, 2024 USD ($)
Segment Reporting Information
Net sales	$ 419.9	$ 467.8
Number of Reportable Segments | Defendent	2
Specialty Brands
Segment Reporting Information
Net sales	$ 207.3	257.3
Specialty Brands | Operating Segments
Segment Reporting Information
Net sales	207.3	257.3
Specialty Generics
Segment Reporting Information
Net sales	212.6	210.5
Specialty Generics | Operating Segments
Segment Reporting Information
Net sales	212.6
Acthar | Specialty Brands
Segment Reporting Information
Net sales	115.4	102.8
Inomax | Specialty Brands
Segment Reporting Information
Net sales	62.5	70.2
Therakos immunotherapy | Specialty Brands
Segment Reporting Information
Net sales	0.0	58.2
Amitiza [Member] | Specialty Brands
Segment Reporting Information
Net sales	20.2	19.4
Other | Specialty Brands
Segment Reporting Information
Net sales	1.8	0.7
Opioids | Specialty Generics
Segment Reporting Information
Net sales	83.7	81.9
ADHD | Specialty Generics
Segment Reporting Information
Net sales	47.2	31.7
Addiction Treatment | Specialty Generics
Segment Reporting Information
Net sales	18.5	15.4
Other Generics | Specialty Generics
Segment Reporting Information
Net sales	3.9	1.5
Generics | Specialty Generics
Segment Reporting Information
Net sales	153.3	130.5
Controlled substances | Specialty Generics
Segment Reporting Information
Net sales	19.1	22.9
APAP | Specialty Generics
Segment Reporting Information
Net sales	33.8	51.7
Other API | Specialty Generics
Segment Reporting Information
Net sales	6.4	5.4
API | Specialty Generics
Segment Reporting Information
Net sales	59.3	80.0
Terlivaz | Specialty Brands
Segment Reporting Information
Net sales	$ 7.4	$ 6.0