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Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2025	Jun. 30, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 3.4	$ 9.8
Restructuring charges		6.4
Restructuring charges	1.9
Currency translation	0.1	(0.4)
Cash payments	(1.0)	(12.4)
Restructuring reserve, ending balance	4.4
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.0
Restructuring charges		1.3
Restructuring charges	0.6
Currency translation	0.0	0.0
Cash payments	0.0	(1.3)
Restructuring reserve, ending balance	0.6
Americas | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.2	0.8
Restructuring charges		1.6
Restructuring charges	0.4
Currency translation	0.0	(0.1)
Cash payments	(0.1)	(2.1)
Restructuring reserve, ending balance	0.5
International | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	3.2	9.0
Restructuring charges		3.5
Restructuring charges	0.9
Currency translation	0.1	(0.3)
Cash payments	(0.9)	$ (9.0)
Restructuring reserve, ending balance	$ 3.3

X

- Definition

Restructuring Charges (Reversal Of Cost)

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Restructuring Charges before Adjustments - Restructuring charges before any adjustments to the accrual.

+ References

No definition available.

+ Details

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Namespace Prefix:	msa_
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Balance Type:	debit
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X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

+ Details

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X

- 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.

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X

- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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