| Cover | Feb. 08, 2021 |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | Atlas Crest Investment Corp. II (the "Company") is filing this Amendment No. 1 on Form 8-K/A (the “Amendment”) to amend and restate the Company’s audited balance sheet as of February 8, 2021 that had been filed with the Company’s Current Report on Form 8-K originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 12, 2021 (the “Original 8-K”). The audited balance sheet is being restated to reflect the classification of the Company’s warrants as a liability, in accordance with the SEC’s April 12, 2021 public statement (the “Statement”) informing market participants that warrants issued by special purpose acquisition companies (“SPACs”) may need to be classified as liabilities as opposed to equity, and being measured at fair value, with changes in fair value each period reported in earnings. The Company had previously classified its private placement warrants and public warrants (collectively, the “warrants”) as equity within the Original 8-K. |
| Document Period End Date | Feb. 8, 2021 |
| Entity File Number | 001-39999 |
| Entity Registrant Name | Atlas Crest Investment Corp. II |
| Entity Central Index Key | 0001838614 |
| Entity Tax Identification Number | 85-4381723 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 399 Park Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | 212 |
| Local Phone Number | 883-3800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A Common Stock and one-third of one Redeemable Warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A Common Stock and one-fourth of one Redeemable Warrant |
| Trading Symbol | ACII. U |
| Security Exchange Name | NYSE |
| Common Class A [Member] | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | ACII |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Title of 12(b) Security | Warrants, each exercisable for one share of Class A Common Stock for $11.50 per share |
| Trading Symbol | ACII. WS |
| Security Exchange Name | NYSE |
