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Contingencies - Summary of Notes Receivable from Insurance Companies and Activity During the Year (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |
Balance beginning of period | $ 67.3 | $ 8.7
Additions | 35.1 | 95.6
Collections | (25.5) | (37.0)
Balance end of period | $ 76.9 | $ 67.3

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- Definition Notes, Loans and Financing Receivable, Insurance Companies, Additions + References No definition available. + Details
Name: | msa_NotesLoansandFinancingReceivableInsuranceCompaniesAdditions
Namespace Prefix: | msa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Notes, Loans and Financing Receivable, Insurance Companies, Proceeds + References No definition available. + Details
Name: | msa_NotesLoansandFinancingReceivableInsuranceCompaniesProceeds
Namespace Prefix: | msa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Notes, Loans and Financing Receivable, Net, Insurance Companies + References No definition available. + Details
Name: | msa_NotesLoansandFinancingReceivableNetInsuranceCompanies
Namespace Prefix: | msa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInLossContingencyRelatedReceivableIncreaseDecreaseRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration