Commitments and Contingencies (Narrative) (Details) $ in Millions			1 Months Ended	3 Months Ended			9 Months Ended
	Apr. 01, 2014 USD ($) Defendent	Sep. 26, 2012 action	Aug. 31, 2012 principal	Dec. 30, 2016 USD ($) Defendent Case order	Jun. 24, 2016 USD ($)	Dec. 25, 2015 USD ($)	Jun. 26, 2015 USD ($)	Sep. 30, 2016 USD ($)	Mar. 25, 2016 USD ($)	Mar. 28, 2014 USD ($)	Aug. 31, 2013 Case
Loss Contingencies [Line Items]
Litigation Settlement, Expense					$ 15.5
Environmental liabilities				$ 76.0
Deferred tax liabilities related to installment sales				1,801.4
Section 453(a) interest				15.9		$ 18.7
Interest Payable, Installment Sales				$ 30.3				$ 25.7
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent	70			98
Environmental liabilities									$ 13.3	$ 23.1
Remedial cost, estimate	$ 1,700.0			$ 1,380.0
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case				11,700
Estimation of liability, historical term				5 years
Estimation of liability, expected future term of claims				7 years
Accrued and other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current				$ 3.0
Questcor Acquisition of Synacthen [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense				$ 102.0
Glenridge Litigation
Loss Contingencies [Line Items]
Number of defendants | principal			3
Pending claims | Case											1
Questcor Securities Litigation
Loss Contingencies [Line Items]
Subsequent actions consolidated into lawsuit | action		4
Litigation Settlement, Amount							$ 38.0
Loss Contingency Accrual							$ 38.0
Mallinckrodt Veterinary, Inc., Millsboro, Delaware [Member]
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into | order				2
Industrial Revenue Bonds
Loss Contingencies [Line Items]
Plant assets exchanged for IRBs				$ 73.7
Minimum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate				38.9
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	365.0			483.4
Maximum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate				121.4
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	$ 3,200.0			$ 2,700.0