Segment Data (Schedule of Segment Reporting Information by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 28, 2024		Jun. 30, 2023		Jun. 28, 2024	Jun. 30, 2023
Net sales	$ 514.3		$ 475.0		$ 982.1	$ 899.6
Operating Income (Loss)	27.4		(56.6)		9.7	(159.2)
Depreciation and amortization	(23.3)		(129.3)		(48.1)	(262.5)
Employee Benefits and Share-based Compensation	(3.4)		(2.7)		(5.3)	(5.3)
Restructuring charges, net	(0.2)		0.2		(10.4)	(1.0)
Restructuring and related charges, net					(10.4)	(1.7)
Separation Costs	(10.3)		(10.3)		(17.0)	(15.2)
Bad Debt Expense, Customer Bankruptcy, Pre-Petition Amount	6.4		0.0		6.4	0.0
Interest Expense	(59.4)		(162.6)		(118.5)	(324.6)
Interest income	6.0		4.7		12.8	9.4
Other expense, net	(3.5)		(1.2)		0.2	(15.8)
Reorganization items, net	0.0		(4.0)		0.0	(9.6)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(29.5)		(219.7)		(95.8)	(499.8)
Specialty Brands
Restructuring and related charges, net	(0.2)		0.0		(10.4)	0.0
Specialty Generics
Net sales	239.8		194.9		450.3	367.5
Corporate, Non-Segment
Corporate and unallocated expenses	(11.1)	[1]	0.6	[1]	(43.0)	(13.4)
Depreciation and amortization	(32.1)		(141.1)		(67.2)	(286.2)
Separation Costs	(10.3)		(10.3)		(17.0)	(15.2)
Operating Segments
Operating Income (Loss)	78.1		96.7		146.2	161.9
Operating Segments | Specialty Brands
Net sales	274.5		280.1		531.8	532.1
Operating Income (Loss)	15.7		61.6		45.6	94.0
Operating Segments | Specialty Generics
Net sales	239.8		194.9		450.3	367.5
Operating Income (Loss)	$ 62.4		$ 35.1		$ 100.6	$ 67.9

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