Document and Entity Information - USD ($)	Dec. 31, 2019	Apr. 20, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	On February 13, 2020, the Company filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (the “Original Form 10-K”) with the U.S. Securities and Exchange Commission (the “SEC”). The Company is filing this Amendment No. 1 on Form 10-K/A (the “Form 10-K/A”) because it will not file a proxy statement for its 2020 Annual General Meeting of Shareholders and will not hold its 2020 Annual General Meeting of Shareholders as a result of the Merger. This Form 10-K/A amends and restates in its entirety Part III, Items 10 through 14 of the Original Form 10-K, to include information previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K. In this Form 10-K/A, unless the context indicates otherwise, the designations “Aircastle,” the “Company,” “we,” “us” or “our” refer to Aircastle Limited and its subsidiaries.
Document Period End Date	Dec. 31, 2019
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Registrant Name	AIRCASTLE LIMITED
Entity Incorporation, State or 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, 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
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false
Entity Public Float			$ 1,100,000,000
Entity Common Stock, Shares Outstanding		14,048
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001362988
Document Annual Report	true
Title of 12(b) Security	Common Shares, par value $0.01 per share
Trading Symbol	N/A