Consolidated Statements of Shareholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Millions			1 Months Ended		12 Months Ended
		Nov. 01, 2021	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Common stock shares outstanding (in shares)				342,024,612	375,801,857		342,024,612
Proceeds from the exercise of warrants			$ 107.5	$ 156.5	$ 107.5		$ 156.5	$ 0.0
Vested (in shares)					943,164
Shares withheld for tax obligation (in shares)					322,594
Decrease for tax withholding obligation					$ 7.3
Stock issuance related to acquisition					$ 601.1	[1]	$ 179.4
Share Capital
Common stock shares outstanding (in shares)				342,024,612	375,801,857		342,024,612	118,261,955	[2]	118,261,955	[2]
Stock issuance related to acquisition (in shares)		23,081,996			23,081,996	[1]	86,249,750
Additional Paid in Capital
Stock-based compensation					$ 23.2
Stock issuance related to acquisition							$ 179.4
Additional Paid in Capital | E&I Acquisition
Stock issuance related to acquisition	[1]	$ 601.1
Previously Reported | Share Capital
Common stock shares outstanding (in shares)								1,000,000.0		1,000,000

[1] On November 1, 2021 the Company issued 23,081,996 shares valued at $601.1 for the acquisition of E&I, refer to "Note 2 - Acquisition" for additional information.

[2] The shares and earnings per share available to holders of the Company’s common shares, prior to the Business Combination, have been recasted as shares reflecting the exchange ratio established in the Business Combination (1.0 Vertiv Holdings share to 118.261955 Vertiv Holdings Co shares).