Segment Data (Schedule of Net Sales from External Customers by Products) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 24, 2021	Jun. 16, 2022	Sep. 24, 2021
Segment Reporting Information
Net sales	$ 465.4	$ 550.4	$ 507.2	$ 874.6	$ 1,611.6
Specialty Brands | Operating Segments
Segment Reporting Information
Net sales	303.5	361.7	359.7	587.1	1,149.6
Specialty Generics
Segment Reporting Information
Net sales	161.9	188.7	147.5	287.5	462.0
Specialty Generics | Operating Segments
Segment Reporting Information
Net sales	161.9	188.7	147.5	287.5	462.0
Acthar | Specialty Brands
Segment Reporting Information
Net sales	125.7	153.2	143.4	221.9	423.9
Inomax | Specialty Brands
Segment Reporting Information
Net sales	80.7	94.2	98.4	165.8	338.3
Ofirmev | Specialty Brands
Segment Reporting Information
Net sales	0.0	(0.2)	4.7	2.5	24.0
Therakos immunotherapy | Specialty Brands
Segment Reporting Information
Net sales	58.0	68.2	62.5	109.6	197.8
Amitiza [Member] | Specialty Brands
Segment Reporting Information
Net sales	37.1	42.9	49.6	81.5	155.8
Other | Specialty Brands
Segment Reporting Information
Net sales	2.0	3.4	1.1	5.8	9.8
Other | Specialty Generics
Segment Reporting Information
Net sales		98.0
Opioids | Specialty Generics
Segment Reporting Information
Net sales	46.5	55.2	46.5	88.8	155.0
ADHD | Specialty Generics
Segment Reporting Information
Net sales	11.6	13.4	8.7	17.5	24.8
Addiction Treatment | Specialty Generics
Segment Reporting Information
Net sales	16.6	19.1	15.3	30.0	47.7
Other Generics | Specialty Generics
Segment Reporting Information
Net sales	2.9	3.0	2.9	4.9	8.4
Generics | Specialty Generics
Segment Reporting Information
Net sales	77.6	90.7	73.4	141.2	235.9
Controlled substances | Specialty Generics
Segment Reporting Information
Net sales	19.7	21.4	19.4	37.6	62.4
APAP | Specialty Generics
Segment Reporting Information
Net sales	57.9	69.2	49.6	96.5	146.8
Other API | Specialty Generics
Segment Reporting Information
Net sales	6.7	7.4	5.1	12.2	16.9
API | Specialty Generics
Segment Reporting Information
Net sales	$ 84.3	$ 98.0	$ 74.1	$ 146.3	$ 226.1