Restructuring and Related Charges (Schedule of Net Restructuring and Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 24, 2016	Jun. 30, 2017	Jun. 24, 2016
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 1.5	$ 15.2	$ 20.2	$ 25.3
Less: non-cash charges, including accelerated share-based compensation expense	(0.9)	(1.2)	(2.4)	(2.9)
Total charges expected to be settled in cash	0.6	14.0	17.8	22.4
Restructuring Fiscal 2016 Plan
Restructuring Cost and Reserve
Restructuring and related charges, net	1.5	0.0	20.2	0.0
2013 Mallinckrodt program
Restructuring Cost and Reserve
Restructuring and related charges, net	0.0	14.3	0.0	22.4
Acquisitions
Restructuring Cost and Reserve
Restructuring and related charges, net	$ 0.0	$ 0.9	$ 0.0	$ 2.9