Consolidated Statements of Shareholders' Equity (Statement) - USD ($) $ in Millions		Total		Cumulative Effect, Period of Adoption, Adjustment	Share Capital		Additional Paid in Capital		Accumulated Deficit		Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)		Previously Reported	Previously Reported Share Capital	Restatement Adjustment
Beginning balance (in shares) at Dec. 31, 2017					118,261,955	[1]									1,000,000
Beginning balance at Dec. 31, 2017		$ (129.6)	[1]	$ (5.0)	$ 0.0	[1]	$ 277.7	[1]	$ (540.8)	[1]	$ (5.0)	$ 133.5	[1]
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]
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)
Net income (loss)		(208.3)												$ (268.9)		$ 60.6
Ending balance at Mar. 31, 2020		$ 276.2												331.9		(55.7)
Beginning balance (in shares) at Dec. 31, 2019		118,261,955			118,261,955	[1]									1,000,000
Beginning balance at Dec. 31, 2019	[1]	$ (704.8)			$ 0.0		277.7		(1,000.6)			18.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(264.3)												(242.7)		(21.6)
Ending balance at Jun. 30, 2020		$ 213.0												350.9		(137.9)
Beginning balance (in shares) at Dec. 31, 2019		118,261,955			118,261,955	[1]									1,000,000
Beginning balance at Dec. 31, 2019	[1]	$ (704.8)			$ 0.0		277.7		(1,000.6)			18.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(367.8)												(258.5)		(109.3)
Ending balance at Sep. 30, 2020		$ 146.1												371.7		(225.6)
Beginning balance (in shares) at Dec. 31, 2019		118,261,955			118,261,955	[1]									1,000,000
Beginning 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)		(327.3)							(327.3)					(183.6)
Stock issuance (in shares)					123,900,000
Stock issuance		1,195.1					1,195.1
Merger recapitalization (in shares)	[2]				86,249,750
Merger recapitalization (2)	[2]	179.4					179.4
Exercise of warrants (in shares)	[3]				13,612,907
Exercise of warrants (3)	[3]	260.4					260.4
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		$ 512.1			$ 0.0		1,791.8		(1,331.2)			51.5		668.3
Beginning balance at Mar. 31, 2020		276.2												331.9		(55.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(56.0)												26.2		(82.2)
Ending balance at Jun. 30, 2020		213.0												350.9		(137.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(103.5)												(15.8)		(87.7)
Ending balance at Sep. 30, 2020		146.1												371.7		(225.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 40.5												74.9		$ (34.4)
Exercise of warrants (in shares)		13,600,000
Ending Balance (in shares) at Dec. 31, 2020		342,024,612			342,024,612
Ending balance at Dec. 31, 2020		$ 512.1			$ 0.0		$ 1,791.8		$ (1,331.2)			$ 51.5		$ 668.3

[1] As a result of the restatement the merger recapitalization has been reduced by the fair value of $116.4 of Warrants as a liability as of February 7, 2020.

[2] The exercise of Warrants includes $156.5 of cash received during the year ended December 31, 2020 for the exercise of Public Warrants and a reduction of warrant liabilities related to the exercise of the Warrants.

[3] 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).