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Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Schedule of Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | $ 16.2 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | $ 17.0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | $ 18.2 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
U.S. and Non-U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit cost (income) | 16.2 see_DefinedBenefitPlanBenefitCostIncome / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember | 17.0 see_DefinedBenefitPlanBenefitCostIncome / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember | 18.2 see_DefinedBenefitPlanBenefitCostIncome / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember
U.S. and Non-U.S. [Member] | Cost of Sales [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | 5.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 5.8 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 6.1 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
U.S. and Non-U.S. [Member] | Selling, General, and Administrative Expenses [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost | $ 10.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | $ 11.2 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | $ 12.1 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_UnitedStatesAndNonUnitedStatesPensionPlanDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

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- Definition Defined benefit plan benefit cost income. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Balance Type: | na
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |