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Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 56.0	$ 56.0
Additions	1.5	0.7
Collections	$ (5.1)	0.0
Balance end of period		$ 56.7

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration