Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 14, 2020
Entity Registrant Name	GX Acquisition Corp.
Entity Central Index Key	0001752828
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity File Number	001-38914
Entity Incorporation, State or Country Code	DE
Class A common stock
Entity Common Stock, Shares Outstanding		28,750,000
Class B common stock
Entity Common Stock, Shares Outstanding		7,187,500