Restructuring and Related Charges (Schedule of Restructuring and Related Charges by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2021	Sep. 25, 2020	Sep. 24, 2021	Sep. 25, 2020
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 11.7	$ 3.2	$ 19.5	$ 15.8
Restructuring and Related Cost, Accelerated Depreciation	(0.7)	0.0	(2.0)	0.0
Restructuring charges, net	11.0	3.2	17.5	15.8
Specialty Brands
Restructuring Cost and Reserve
Restructuring and related charges, net	0.1	0.0	0.1	0.1
Specialty Generics
Restructuring Cost and Reserve
Restructuring and related charges, net	0.0	0.0	0.0	0.1
Corporate
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 11.6	$ 3.2	$ 19.4	$ 15.6