Acquisitions (Tables)

9 Months Ended

Sep. 30, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the fair values of the Autronica assets acquired and liabilities assumed at the date of the acquisition:

(In millions)	July 9, 2026
Cash and cash equivalents	$	8.4
Trade receivables	33.0
Inventories	19.8
Prepaid expenses and other current assets	19.9
Other noncurrent assets	26.9
Customer relationships	188.7
Trade name	46.3
Developed technology	43.5
Goodwill	316.6
Total assets acquired	$	703.1
Deferred tax liability	(60.4)
Other liabilities	(71.1)
Total liabilities assumed	$	(131.5)
Net assets acquired	$	571.6

Schedule of Pro Forma Financial Information

The following unaudited pro forma information presents our combined results as if MSA's acquisitions of Autronica in 2026 and M&C during 2025 had occurred on January 1, 2025. The unaudited pro forma financial information was prepared to give effect to events that are (1) directly attributable to the acquisitions; (2) factually supportable; and (3) expected to have a continuing impact on the combined company's results. There were no material transactions between MSA and the acquired businesses during the periods presented that are required to be eliminated in the unaudited pro forma condensed combined financial information. The unaudited pro forma condensed combined financial information does not reflect any cost savings, operating synergies, or revenue enhancements that the combined companies may achieve as a result of the acquisition or the costs to integrate the operations or the costs necessary to achieve cost savings, operating synergies, or revenue enhancements.

	Three Months Ended				Nine Months Ended
(In millions, except per share amounts)	September 30, 2026		September 30, 2025		September 30, 2026		September 30, 2025
Net sales	$	540.1	$	502.2	$	1,588.9	$	1,493.7
Net income	55.7		75.3		206.0		211.0
Basic earnings per share	1.45		1.92		5.32		5.38
Diluted earnings per share	1.44		1.92		5.31		5.36