Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-38518
Entity Registrant Name	Vertiv Holdings Co
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-2376902
Entity Address, Address Line One	1050 Dearborn Dr
Entity Address, City or Town	Columbus
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43085
City Area Code	614
Local Phone Number	888-0246
Title of 12(b) Security	Class A common stock, $0.0001 par value per share
Trading Symbol	VRT
Security Exchange Name	NYSE
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 Common Stock, Shares Outstanding (in shares)		352,591,505
Entity Central Index Key	0001674101
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Amendment Flag	false