Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2022	Apr. 03, 2023	Jun. 30, 2022
Cover [Abstract]
Entity Registrant Name	ALTRA INDUSTRIAL MOTION CORP.
Entity Central Index Key	0001374535
Trading Symbol	AIMC
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2.7
Document Type	10-K/A
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	true
Entity File Number	001-33209
Entity Tax Identification Number	61-1478870
Entity Address, Address Line One	300 Granite Street
Entity Address, Address Line Two	Suite 201
Entity Address, City or Town	Braintree
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02184
City Area Code	781
Local Phone Number	917-0600
Entity Common Stock, Shares Outstanding		1,000
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Security Exchange Name	NASDAQ
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $0.01 par value
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE: None.
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Boston, Massachusetts
Amendment Description	This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, originally filed with the Securities and Exchange Commission (the “SEC”) on March 1, 2023 (the “Original Filing”). We are filing this Amendment pursuant to General Instruction G(3) of Form 10-K to include the information required by Part III of Form 10-K that we did not include in the Original Filing, as we do not intend to file a definitive proxy statement for an annual meeting of shareholders within 120 days of the end of our fiscal year ended December 31, 2022. In addition, in connection with the filing of this Amendment and pursuant to the rules of the SEC, we are including with this Amendment new certifications of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Item 15 of Part IV has also been amended to reflect the filing of these new certifications. Except as described above, no other changes have been made to the Original Filing. The Original Filing continues to speak as of the date of the Original Filing, and we have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Original Filing. Unless otherwise indicated or unless the context requires otherwise, the terms “Altra”, “the Company,” “we,” “us” and “our” refer to Altra Industrial Motion Corp. and its subsidiaries, except where the context otherwise requires or indicates. As previously announced, on March 27, 2023, the Company was acquired by Regal Rexnord Corporation, a Wisconsin corporation (“Parent”), pursuant to an Agreement and Plan of Merger (the “Merger Agreement”) dated as of October 27, 2022 with Parent, and Aspen Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Merger Sub”). At the effective time of the merger on March 27, 2023, Merger Sub merged with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent. This Amendment does not address events occurring after the Merger and the disclosures contained herein relate to the Company prior to the closing of the Merger. This Amendment should be read in conjunction with the Original Filing and with our filings with the SEC subsequent to the Original Filing. On March 27, 2023, as a result of the consummation of the Merger and per our request, the Nasdaq Global Market filed a Form 25 with the SEC to voluntarily delist our common stock on the Nasdaq Global Market. We will file a Form 15 with the SEC to effect the deregistration of our common stock under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Upon the filing of the Form 15, our obligations to file certain reports with the SEC, including reports on Forms 10-K, 10-Q and 8-K, will immediately be suspended. Prior to the filing of such Form 15, SEC rules and regulations require the Company to first file this Amendment in order to complete the Company’s Original Filing and be current in its Exchange Act reporting obligations. After the filing of this Amendment, the Company no longer intends to file any reports under the Exchange Act.

Altra Industrial Motion Corp. 10-K/A