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Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Funded Status for Pension Plans (Detail) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Other	$ 2.1	$ 33.5
French Plans
Defined Benefit Plan Disclosure [Line Items]
Other		$ 27.3

X

- Definition

Defined benefit plan other income expense benefit obligation.

+ References

No definition available.

+ Details

Name:	see_DefinedBenefitPlanOtherIncomeExpenseBenefitObligation
Namespace Prefix:	see_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=see_FrenchPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: