Consolidated Statements of Shareholders' Equity (Statement) - USD ($) $ in Millions		Total	Share Capital		Additional Paid in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Previously Reported Share Capital
Beginning balance (in shares) at Dec. 31, 2017			118,261,955	[1]				1,000,000
Beginning balance at Dec. 31, 2017	[1]	$ (129.6)	$ 0.0		$ 277.7	$ (540.8)	$ 133.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(314.0)				(314.0)
Other comprehensive loss, net of tax		(91.7)					(91.7)
Ending Balance (in shares) at Dec. 31, 2018			118,261,955	[1]				1,000,000
Ending balance at Dec. 31, 2018	[1]	(540.3)	$ 0.0		277.7	(859.8)	41.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ASC 606 cumulative adjustment		(5.0)				(5.0)
Net income (loss)		(140.8)				(140.8)
Other comprehensive loss, net of tax		$ (23.7)					(23.7)
Ending Balance (in shares) at Dec. 31, 2019		118,261,955	118,261,955	[1]				1,000,000
Ending balance at Dec. 31, 2019	[1]	$ (704.8)	$ 0.0		277.7	(1,000.6)	18.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Tax Receivable Agreement		(133.4)			(133.4)
Net income (loss)		(183.6)				(183.6)
Stock issuance (in shares)			123,900,000
Stock issuance		1,195.1			1,195.1
Merger recapitalization (in shares)			86,249,750
Merger recapitalization		295.8			295.8
Exercise of warrants (in shares)			13,612,907
Exercise of warrants		156.5			156.5
Stock-based compensation		13.0			13.0
Dividends		(3.3)				(3.3)
Other merger adjustment		(0.4)			(0.4)
Other comprehensive loss, net of tax		$ 33.4					33.4
Ending Balance (in shares) at Dec. 31, 2020		342,024,612	342,024,612
Ending balance at Dec. 31, 2020		$ 668.3	$ 0.0		$ 1,804.3	$ (1,187.5)	$ 51.5

[1] 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).