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Revenue Recognition, Contracts with Customers - Contracts with Customer Asset and Liability (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract assets | $ 0.0 | $ 0.0 |
Contract liabilities | $ 6.3 | $ 5.5 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract assets |  |  | $ 0.0
Contract liabilities |  |  | $ 3.1

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- Definition Contract With Customer Asset Net + References No definition available. + Details
Name: | see_ContractWithCustomerAssetNet
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract With Customer, Liability + References No definition available. + Details
Name: | see_ContractWithCustomerLiability
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition [Line Items] for Revenue, Initial Application Period Cumulative Effect Transition [Table] + References No definition available. + Details
Name: | see_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems
Namespace Prefix: | see_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | see_InitialApplicationPeriodCumulativeEffectTransitionAxis=see_CalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |