Segment Data (Schedule of Net Sales from External Customers by Products) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 25, 2016
Segment Reporting Information
Net sales		$ 810.9	$ 815.8
Operating Segments
Segment Reporting Information
Net sales		795.8	799.4
Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		557.2	535.0
Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		238.6	264.4
Corporate, Non-Segment
Segment Reporting Information
Net sales	[1]	15.1	16.4
Acthar | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		271.8	248.4
Inomax | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		128.4	115.5
Ofirmev | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		73.4	71.1
Therakos immunotherapy | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		51.2	50.2
Hemostasis Products | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		13.1	11.4
Other | Operating Segments | Specialty Brands
Segment Reporting Information
Net sales		19.3	38.4
Other | Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		55.1	39.2
Hydrocodone (API) and hydrocodone-containing tablets | Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		30.3	40.8
Oxycodone (API) and oxycodone-containing tablets | Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		22.1	37.9
Methylphenidate ER | Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		23.7	24.6
Other Controlled Substances | Operating Segments | Specialty Generics
Segment Reporting Information
Net sales		$ 107.4	$ 121.9

[1] Represents net sales under an ongoing supply agreement with the acquirer of the CMDS business.