Commitments and Contingencies (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2014 USD ($) Defendent	Jun. 29, 2018 USD ($) Case	Jun. 30, 2017 USD ($)	Jun. 29, 2018 USD ($) lawsuit Case	Jun. 30, 2017 USD ($)	Dec. 29, 2017 USD ($)	Sep. 25, 2015 order	Mar. 25, 2016 USD ($)	Mar. 27, 2015 USD ($)	Mar. 28, 2014 USD ($)
Loss Contingencies [Line Items]
Litigation Settlement, Expense						$ 102.0
Payments for Legal Settlements						35.0
Environmental liabilities		$ 65.2		$ 65.2
Deferred tax liabilities related to installment sales		554.2		554.2
Section 453(a) interest		6.1	$ 17.8	11.7	$ 36.2
Interest Payable, Installment Sales		$ 52.9		$ 52.9		$ 46.0
Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Number of defendants | Defendent	70
Environmental liabilities									$ 13.3	$ 23.1
Remedial cost, estimate	$ 1,700.0							$ 1,380.0
Asbestos Matters
Loss Contingencies [Line Items]
Pending claims | Case		11,600		11,600
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		$ 3.0
Opioid Crisis [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				1,019
Mallinckrodt Veterinary, Inc., Millsboro, Delaware [Member]
Loss Contingencies [Line Items]
Number of Administrative Orders of Consent Entered Into | order							2
Minimum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate		27.1		$ 27.1
Minimum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	365.0
Maximum | Environmental Remediation
Loss Contingencies [Line Items]
Remedial cost, estimate		$ 96.1		$ 96.1
Maximum | Lower Passaic River, New Jersey
Loss Contingencies [Line Items]
Remedial cost, estimate	$ 3,200.0