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Stock Plans - Weighted Average Risk Assumptions (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares
Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option (dollars per share)	$ 101.03
Monte Carlo Approach | Stock options exercised
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option (dollars per share)	$ 59.07
Risk-free interest rate	2.30%
Expected dividend yield	1.70%
Expected volatility	31.00%
Expected life (years)	6 years 4 months 24 days
Monte Carlo Approach | Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option (dollars per share)	$ 99.82
Risk-free interest rate	2.47%
Expected dividend yield	1.57%
Expected volatility	26.60%
MSA stock beta	1.094

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Stock Beta

+ References

No definition available.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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