Commitments and Contingencies (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 26, 2012 action	Aug. 31, 2012 principal	Dec. 25, 2015 USD ($) Case Defendent	Jun. 26, 2015 USD ($)	Dec. 26, 2014 USD ($)	Jun. 26, 2015 USD ($)	Mar. 27, 2015 USD ($)	Apr. 01, 2014 USD ($)	Aug. 31, 2013 Case
Loss Contingencies [Line Items]
Litigation Settlement, Expense				$ 15.5
Environmental liabilities			$ 75.0
Deferred tax liabilities related to installment sales			2,206.6
Section 453(a) interest			18.7		$ 2.8
Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost range, minimum			38.2
Remedial cost range, maximum			$ 119.0
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent			70
Remedial cost range, minimum			$ 483.4					$ 365.0
Remedial cost range, maximum			$ 2,700.0					3,200.0
Environmental liabilities					$ 23.1		$ 13.3
Remedial cost, estimate								$ 1,700.0
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case			12,800
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
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		38.0
Mallinckrodt Veterinary, Inc., Millsboro, Delaware [Member]
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into			2
Tax Matters Agreement | Covidien
Loss Contingencies [Line Items]
Tax agreement, tax threshold			$ 200.0
Industrial Revenue Bonds
Loss Contingencies [Line Items]
Plant assets exchanged for IRBs			$ 88.0
Tastemaker [Member]
Loss Contingencies [Line Items]
Indemnification						$ 22.5