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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount		$ 23.0us-gaap_LineOfCredit
Other foreign loans, Carrying Amount	87.2see_OtherForeignLoansCarryingValue	73.9see_OtherForeignLoansCarryingValue
Other foreign loans, Fair Value	87.1see_OtherForeignLoansFairValueDisclosure	73.8see_OtherForeignLoansFairValueDisclosure
Other domestic loans, Carrying Amount	2.8see_OtherDomesticLoansCarryingValue	59.2see_OtherDomesticLoansCarryingValue
Other domestic loans, Fair Value	3.2see_OtherDomesticLoansFairValueDisclosure	59.2see_OtherDomesticLoansFairValueDisclosure
Total debt, Carrying Amount	4,348.3us-gaap_DebtAndCapitalLeaseObligations	4,414.0us-gaap_DebtAndCapitalLeaseObligations
Total debt, Fair Value	4,561.7see_DebtAndCapitalLeasedObligationFairValueDisclosure	4,569.4see_DebtAndCapitalLeasedObligationFairValueDisclosure
Term Loan A Facility Due July 2017 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount	249.7us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandSeventeenMember	249.7us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandSeventeenMember
Credit Facility, Fair Value	249.7us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandSeventeenMember	249.7us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandSeventeenMember
Term Loan A Facility Due July 2019 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount	1,106.9us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember	1,129.4us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember
Credit Facility, Fair Value	1,106.9us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember	1,129.4us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember
6.50% Senior Notes Due December 2020 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	428.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member	428.1us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member
Senior Notes, Fair Value	476.6us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member	469.7us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member
8.375% Senior Notes Due September 2021 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	750.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember	750.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember
Senior Notes, Fair Value	843.9us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember	843.3us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember
4.875% Senior Notes due December 2022 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember
Senior Notes, Fair Value	434.0us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember	423.3us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember
5.25% Senior Notes Due April 2023 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember
Senior Notes, Fair Value	445.1us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember	429.6us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember
5.125% Senior Notes due December 2024 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember	425.0us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember
Senior Notes, Fair Value	440.4us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember	428.5us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember
6.875% Senior Notes Due July 2033 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Senior Notes, Carrying Amount	448.7us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember	448.7us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember
Senior Notes, Fair Value	$ 474.8us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember	$ 462.9us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember

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Other domestic loans carrying value.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Fair value of the amount outstanding under the credit facility.

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Fair value portion of notes payable.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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