Segment Data (Schedule of Segment Reporting Information by Business Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Apr. 01, 2022	Mar. 26, 2021
Net sales		$ 490.9	$ 558.0
Operating Income (Loss)		(20.8)	(17.5)
Depreciation and amortization		(155.1)	(145.3)
Employee Benefits and Share-based Compensation		(1.2)	(3.6)
Restructuring and related charges, net		(6.8)	(1.1)
Non-restructuring impairment charges		0.0	(64.5)
Specialty Generics
Restructuring and related charges, net		(3.5)	0.0
Corporate, Non-Segment
Corporate and unallocated expenses	[1]	(32.8)	(22.6)
Depreciation and amortization		(177.2)	(169.6)
Restructuring and related charges, net		(6.8)	(0.4)
Separation Costs	[2]	(2.0)	(0.6)
Operating Segments
Operating Income (Loss)		199.2	243.8
Operating Segments | Specialty Brands
Net sales		339.4	408.4
Operating Income (Loss)		164.8	212.1
Operating Segments | Specialty Generics
Net sales		151.5	149.6
Operating Income (Loss)		$ 34.4	$ 31.7

[1] Includes administration expenses and certain compensation, legal, environmental and other costs not charged to the Company's reportable segments.

[2] Represents costs included in selling, general and administrative expenses, primarily related to professional fees and costs incurred as the Company explores potential sales of non-core assets to enable further deleveraging post-emergence.