SHAREHOLDERS' EQUITY (Summary Of Share-Based Incentive Plan Grant Activity For Options and SAR's) (Details)	3 Months Ended
Mar. 31, 2023 $ / shares shares
Options and SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) \| shares	147,174
Options granted, weighted average exercise price (in dollars per share) \| $ / shares	$ 54.96
Options and SARs \| Employees Of Altra
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) \| shares	32,419
Options granted, weighted average exercise price (in dollars per share) \| $ / shares	$ 57.64
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options granted (in shares) \| shares	20,400
Awards other than options granted, weighted average fair value at grant date (in dollars per share) \| $ / shares	$ 135.29
Restricted Stock Awards \| Employees Of Altra
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options granted (in shares) \| shares	20,114
Awards other than options granted, weighted average fair value at grant date (in dollars per share) \| $ / shares	$ 135.50
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options granted (in shares) \| shares	248,794
Awards other than options granted, weighted average fair value at grant date (in dollars per share) \| $ / shares	$ 141.92
Restricted Stock Units \| Employees Of Altra
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options granted (in shares) \| shares	161,414
Awards other than options granted, weighted average fair value at grant date (in dollars per share) \| $ / shares	$ 135.50
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options granted (in shares) \| shares	58,807
Awards other than options granted, weighted average fair value at grant date (in dollars per share) \| $ / shares	$ 235.77

The number of grants made 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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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).

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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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Gross number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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