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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 | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Credit Facility, Carrying Amount | $ 23.0 us-gaap_LineOfCredit | $ 0 us-gaap_LineOfCredit
Other foreign loans, Carrying Amount | 73.9 see_OtherForeignLoansCarryingValue | 85.0 see_OtherForeignLoansCarryingValue
Other foreign loans, Fair Value | 73.8 see_OtherForeignLoansFairValueDisclosure | 84.9 see_OtherForeignLoansFairValueDisclosure
Other domestic loans, Carrying Amount | 59.2 see_OtherDomesticLoansCarryingValue | 0.4 see_OtherDomesticLoansCarryingValue
Other domestic loans, Fair Value | 59.2 see_OtherDomesticLoansFairValueDisclosure | 0.4 see_OtherDomesticLoansFairValueDisclosure
Total debt, Carrying Amount | 4,414.0 us-gaap_DebtAndCapitalLeaseObligations | 4,399.5 us-gaap_DebtAndCapitalLeaseObligations
Total debt, Fair Value | 4,569.4 see_DebtAndCapitalLeasedObligationFairValueDisclosure | 4,599.1 see_DebtAndCapitalLeasedObligationFairValueDisclosure
12% Senior Notes Due February 2014 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes, Carrying Amount |  | 150.3 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember
Senior Notes, Fair Value |  | 150.6 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember
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 | 249.7 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandSeventeenMember |
Credit Facility, Fair Value | 249.7 us-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 | 1,129.4 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember | 684.5 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember
Credit Facility, Fair Value | 1,129.4 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember | 684.5 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanAFacilityDueTwoThousandNineteenMember
Term Loan B Facility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Credit Facility, Carrying Amount |  | 681.6 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = see_TermLoanBFacilityMember
Credit Facility, Fair Value |  | 681.6 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_LongtermDebtTypeAxis = see_TermLoanBFacilityMember
8.125% Senior Notes Due September 2019 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Senior Notes, Carrying Amount |  | 750.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember
Senior Notes, Fair Value |  | 841.4 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember
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 | 428.1 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member | 424.1 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member
Senior Notes, Fair Value | 469.7 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SeniorNotesSixPointFivePercentageDue2020Member | 456.7 us-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 | 750.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember | 750.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember
Senior Notes, Fair Value | 843.3 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember | 853.1 us-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 | 425.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember |
Senior Notes, Fair Value | 423.3 us-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 | 425.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember | 425.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember
Senior Notes, Fair Value | 429.6 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember | 414.7 us-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 | 425.0 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember |
Senior Notes, Fair Value | 428.5 us-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 | 448.7 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember | 448.6 us-gaap_SeniorLongTermNotes / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember
Senior Notes, Fair Value | $ 462.9 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember | $ 431.2 us-gaap_NotesPayableFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember

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- Definition Other domestic loans carrying value. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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