Performance period.

No definition available.

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Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

Name:	us-gaap_AwardTypeAxis=see_TwoThousandSixteenThreeYearPerformanceShareUnitsAwardsMember
Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=see_PerformanceShareUnitsAwardsMember
Namespace Prefix:
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- Details

Name:	see_PerformanceTargetAxis=see_NetTradeSalesGrowthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity (Deficit) - Number of PSUs Granted Based On Net Trade Sales Growth and Grant Date Fair Value (Details) - $ / shares		12 Months Ended
	May 18, 2017	Dec. 31, 2018	Dec. 31, 2017
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
2016 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years	3 years
Number of units granted (in shares)		171,585
Fair value on grant date (in usd per share)		$ 42.29
Net Trade Sales Growth \| PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in shares)		57,378	99,522
Fair value on grant date (in usd per share)		$ 41.72	$ 45.21