| Cover | Apr. 28, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 28, 2021 |
| Entity Registrant Name | VERTIV HOLDINGS CO |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38518 |
| Entity Tax Identification Number | 81-2376902 |
| Entity Address, Address Line One | 1050 Dearborn Drive |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, $0.0001 par value per share |
| Trading Symbol | VRT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001674101 |
| Amendment Flag | false |
