| Document and Entity Information | Jun. 03, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001362988 |
| Document Type | 8-K |
| Document Period End Date | Jun. 3, 2021 |
| Entity Registrant Name | AIRCASTLE LIMITED |
| Entity Incorporation State Country Code | D0 |
| Entity File Number | 001-32959 |
| Entity Tax Identification Number | 98-0444035 |
| Entity Address, Address Line One | c/o Aircastle Advisor LLC |
| Entity Address, Address Line Two | 201 Tresser Boulevard |
| Entity Address, Address Line Three | Suite 400 |
| Entity Address, City or Town | Stamford |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06901 |
| City Area Code | (203) |
| Local Phone Number | 504-1020 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
