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Restructuring Activities - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | $ 47.8 | $ 12.1 | $ 2.5
Restructuring expected accrual to pay | 33.5 |  |
Restructuring expected accrual remaining to pay | $ 4.0 |  |

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- Definition Restructuring accrual expected to pay in next twelve month. + References No definition available. + Details
Name: | see_RestructuringAccrualExpectedToPayInNextTwelveMonth
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Restructuring accrual expected to pay in year two and three. + References No definition available. + Details
Name: | see_RestructuringAccrualExpectedToPayInYearTwoAndThree
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Restructuring and other charges excluding amounts related to foreign subsidiaries. + References No definition available. + Details
Name: | see_RestructuringAndOtherChargesExcludingAmountsRelatedToForeignSubsidiaries
Namespace Prefix: | see_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration