Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 25, 2016
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 18.7	$ 10.1
Less: non-cash charges, including accelerated share-based compensation expense	(1.5)	(1.7)
Total charges expected to be settled in cash	17.2	8.4
Restructuring Fiscal 2016 Plan
Restructuring Cost and Reserve
Restructuring and related charges, net	18.7	0.0
2013 Mallinckrodt program
Restructuring Cost and Reserve
Restructuring and related charges, net	0.0	8.1
Acquisitions
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 0.0	$ 2.0