Restructuring and Related Charges (Schedule of Restructuring and Related Charges by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Dec. 27, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	$ 29.0	$ 49.8	$ (1.7)
Less: accelerated depreciation	(2.1)	(12.3)	0.0
Restructuring charges, net	26.9	37.5	(1.7)
Specialty Brands [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	0.1	0.1	(13.7)
Specialty Generics [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	4.9	0.1	10.0
Corporate
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	$ 24.0	$ 49.6	$ 2.0