UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Millions		Total	Common Share Capital	Treasury Share Capital	Additional Paid in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2023			381,788,876
Beginning balance at Dec. 31, 2023		$ 2,014.9	$ 0.0	$ 0.0	$ 2,711.3	$ (691.9)	$ (4.5)
Beginning balance, treasury (in shares) at Dec. 31, 2023				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(5.9)				(5.9)
Exercise of employee stock options (in shares)			1,109,113
Exercise of employee stock options		14.4			14.4
Stock-based compensation, net of withholding for tax (in shares)	[1]		102,833
Stock-based compensation, net of withholding for tax	[1]	17.3			17.3
Employee 401K match with Vertiv stock (in shares)			44,968
Employee 401K match with Vertiv stock		2.2			2.2
Dividend		(9.3)				(9.3)
Repurchases of common stock (in shares)			(9,076,444)	9,076,444
Repurchase of common stock		(605.9)		$ (605.9)
Other comprehensive income (loss), net of tax		(34.3)					(34.3)
Ending balance, treasury (in shares) at Mar. 31, 2024				9,076,444
Ending balance (in shares) at Mar. 31, 2024			373,969,346
Ending balance at Mar. 31, 2024		$ 1,393.4	$ 0.0	$ (605.9)	2,745.2	(707.1)	(38.8)
Beginning balance (in shares) at Dec. 31, 2024		380,703,974	380,703,974
Beginning balance at Dec. 31, 2024		$ 2,434.3	$ 0.0	$ 0.0	2,821.4	(238.3)	(148.8)
Beginning balance, treasury (in shares) at Dec. 31, 2024				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		164.5				164.5
Exercise of employee stock options (in shares)			109,017
Exercise of employee stock options		1.3			1.3
Stock-based compensation, net of withholding for tax (in shares)	[2]		169,340
Stock-based compensation, net of withholding for tax	[2]	4.5			4.5
Employee 401K match with Vertiv stock (in shares)			18,813
Employee 401K match with Vertiv stock		2.4			2.4
Dividend		(14.2)				(14.2)
Other comprehensive income (loss), net of tax		$ 73.6					73.6
Ending balance, treasury (in shares) at Mar. 31, 2025				0
Ending balance (in shares) at Mar. 31, 2025		381,001,144	381,001,144
Ending balance at Mar. 31, 2025		$ 2,666.4	$ 0.0	$ 0.0	$ 2,829.6	$ (88.0)	$ (75.2)

[1] Net stock compensation activity includes 146,095 vested shares offset by 43,262 shares withheld for taxes valued at $3.0, stock-based compensation of $9.2, and employee incentive compensation of $11.1 awarded in fully vested shares.

[2] Net stock compensation activity includes 239,098 vested shares offset by 69,758 shares withheld for taxes valued at $6.7 and stock-based compensation of $11.2.