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Revenue Recognition, Contracts with Customers - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Revenue From Contract With Customer [Abstract] |
Revenue recognized from performance obligations satisfied In previous periods | $ 2.0
Revenue recognized that was included in contract liability | $ 0.7

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- Definition Contract with Customer, Liability, Revenue Recognized + References No definition available. + Details
Name: | see_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Performance Obligation Satisfied in Previous Period + References No definition available. + Details
Name: | see_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue From Contract With Customer [Abstract] + References No definition available. + Details
Name: | see_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | see_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration