Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 13, 2019
Entity Registrant Name	GX Acquisition Corp.
Entity Central Index Key	0001752828
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity File Number	001-38914
Entity Incorporation, State or Country Code	DE
Entity Reporting Status Current	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
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		28,750,000
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		7,187,500