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Debt and Credit Facilities - Total Debt Outstanding (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Short-term borrowings $ 130.4us-gaap_ShortTermBorrowings $ 81.6us-gaap_ShortTermBorrowings [1]
Current portion of long-term debt 1.1us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 201.5us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent [1]
Total current debt 131.5us-gaap_DebtCurrent 283.1us-gaap_DebtCurrent
Other 1.6us-gaap_OtherLongTermDebtNoncurrent 2.3us-gaap_OtherLongTermDebtNoncurrent
Total long-term debt, less current portion 4,282.5us-gaap_LongTermDebtAndCapitalLeaseObligations 4,116.4us-gaap_LongTermDebtAndCapitalLeaseObligations [1]
Total debt 4,414.0us-gaap_DebtAndCapitalLeaseObligations 4,399.5us-gaap_DebtAndCapitalLeaseObligations
Term Loan A Facility Due July 2017 [Member]    
Debt Instrument [Line Items]    
Credit facility amount outstanding 249.7us-gaap_LongTermLineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandSeventeenMember
 
Term Loan A Facility Due July 2019 [Member]    
Debt Instrument [Line Items]    
Credit facility amount outstanding 1,129.4us-gaap_LongTermLineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember
634.8us-gaap_LongTermLineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember
Term Loan B Facility Due October 2018 [Member]    
Debt Instrument [Line Items]    
Credit facility amount outstanding   681.6us-gaap_LongTermLineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanBFacilityDueOctoberTwoThousandEighteenMember
8.125% Senior Notes Due September 2019 [Member]    
Debt Instrument [Line Items]    
Senior Notes   750.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember
6.50% Senior Notes Due December 2020 [Member]    
Debt Instrument [Line Items]    
Senior Notes 428.1us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member
424.1us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member
8.375% Senior Notes Due September 2021 [Member]    
Debt Instrument [Line Items]    
Senior Notes 750.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember
750.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember
4.875% Senior Notes due December 2022 [Member]    
Debt Instrument [Line Items]    
Senior Notes 425.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember
 
5.25% Senior Notes Due April 2023 [Member]    
Debt Instrument [Line Items]    
Senior Notes 425.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember
425.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember
5.125% Senior Notes due December 2024 [Member]    
Debt Instrument [Line Items]    
Senior Notes 425.0us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember
 
6.875% Senior Notes Due July 2033 [Member]    
Debt Instrument [Line Items]    
Senior Notes $ 448.7us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember
$ 448.6us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember
[1] Certain amounts have been revised to reflect the retrospective application of the Company’s change in inventory costing method for certain U.S. inventories to the FIFO method from the LIFO method. Refer to Note 2, “Summary of Significant Accounting Policies - Inventories,” of the notes to consolidated financial statements for further details surrounding this accounting policy change.