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Revenue Recognition, Contracts with Customers - Revenue Remaining Performance Obligations (Details) $ in Millions | Mar. 31, 2018 USD ($)
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Revenue Performance Obligation [Abstract] |
Revenue, remaining performance obligation, Short-term | $ 2.8
Revenue, remaining performance obligation, Long-term | 3.5
Total revenue, expected to be recognized | $ 6.3

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- Definition Revenue Performance Obligation [Abstract] + References No definition available. + Details
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Period Type: | duration

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- Definition Revenue, Remaining Performance Obligation + References No definition available. + Details
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Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revenue, Remaining Performance Obligation, Current + References No definition available. + Details
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Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revenue, Remaining Performance Obligation, Noncurrent + References No definition available. + Details
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Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant