Segment Data (Schedule of Net Sales from External Customers by Products) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			6 Months Ended
	Jul. 01, 2022		Jun. 16, 2022	Jun. 25, 2021		Jun. 16, 2022	Jun. 25, 2021
Segment Reporting Information
Net sales	$ 85.0		$ 383.7	$ 546.4		$ 874.6	$ 1,104.4
Specialty Brands | Operating Segments
Segment Reporting Information
Net sales	58.2		247.7	381.5		587.1	789.9
Specialty Generics
Segment Reporting Information
Net sales	26.8		136.0	164.9		287.5	314.5
Specialty Generics | Operating Segments
Segment Reporting Information
Net sales	26.8		136.0	164.9		287.5	314.5
Acthar | Specialty Brands
Segment Reporting Information
Net sales	27.5		94.2	151.5		221.9	280.5
Inomax | Specialty Brands
Segment Reporting Information
Net sales	13.5		66.8	105.9		165.8	239.9
Ofirmev | Specialty Brands
Segment Reporting Information
Net sales	(0.2)		(0.1)	6.5		2.5	19.3
Therakos immunotherapy | Specialty Brands
Segment Reporting Information
Net sales	10.2		49.7	68.5		109.6	135.3
Amitiza [Member] | Specialty Brands
Segment Reporting Information
Net sales	5.8	[1]	33.8	44.8	[1]	81.5	106.2	[1]
Other | Specialty Brands
Segment Reporting Information
Net sales	1.4		3.3	4.3		5.8	8.7
Opioids | Specialty Generics
Segment Reporting Information
Net sales	8.7		38.8	53.8		88.8	108.5
ADHD | Specialty Generics
Segment Reporting Information
Net sales	1.8		6.8	7.8		17.5	16.1
Addiction Treatment | Specialty Generics
Segment Reporting Information
Net sales	2.5		14.1	16.0		30.0	32.4
Other Generics | Specialty Generics
Segment Reporting Information
Net sales	0.1		2.0	3.6		4.9	5.5
Generics | Specialty Generics
Segment Reporting Information
Net sales	13.1		61.7	81.2		141.2	162.5
Controlled substances | Specialty Generics
Segment Reporting Information
Net sales	1.7		17.2	25.6		37.6	43.0
APAP | Specialty Generics
Segment Reporting Information
Net sales	11.3		50.2	51.7		96.5	97.2
Other API | Specialty Generics
Segment Reporting Information
Net sales	0.7		6.9	6.4		12.2	11.8
API | Specialty Generics
Segment Reporting Information
Net sales	$ 13.7		$ 74.3	$ 83.7		$ 146.3	$ 152.0

[1] Amitiza consists of both product net sales and royalties. Refer to Note 4 for further details on Amitiza's revenues.