Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring and Related Charges (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017	Feb. 01, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ (1.7)	$ 103.0	$ 31.2
2018 Program \| Minimum
Restructuring Cost and Reserve [Line Items]
Mallinckrodt program expected cost range				$ 100.0
2018 Program \| Maximum
Restructuring Cost and Reserve [Line Items]
Mallinckrodt program expected cost range				$ 125.0
Raplixa [Member] \| Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 51.1