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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 10, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Quarterly Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-32959    
Entity Registrant Name AIRCASTLE LIMITED    
Entity Incorporation, State or Country Code D0    
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    
City Area Code 203    
Local Phone Number 504-1020    
Title of Each Class Common Shares, par value $0.01 per share    
Trading Symbol AYR    
Name of Each Exchange on Which Registered NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,100
Entity Common Stock, Shares Outstanding   75,109,023  
Documents Incorporated by Reference [Text Block]
Documents of Which Portions
Are Incorporated by Reference
 
Parts of Form 10-K into Which Portion
Of Documents Are Incorporated
Portions of the Proxy Statement for Aircastle Limited for its 2020 Annual General Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K, provided that if such Proxy Statement is not filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Form 10-K, an amendment to this Form 10-K shall be filed no later than the end of such 120-day period.
 
Part III
 
(Items 10, 11, 12, 13 and 14)
    
Entity Central Index Key 0001362988    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Address, Postal Zip Code 06901