UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Millions		Total	Common Share Capital	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2024			380,703,974
Beginning balance at Dec. 31, 2024		$ 2,434.3	$ 0.0	$ 2,821.4	$ (238.3)	$ (148.8)
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 activity, net of withholding for tax (in shares)	[1]		169,340
Stock-based compensation activity, net of withholding for tax	[1]	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 (in shares) at Mar. 31, 2025			381,001,144
Ending balance at Mar. 31, 2025		$ 2,666.4	$ 0.0	2,829.6	(88.0)	(75.2)
Beginning balance (in shares) at Dec. 31, 2025		382,553,680	382,553,680
Beginning balance at Dec. 31, 2025		$ 3,941.3	$ 0.0	2,895.2	1,027.9	18.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		390.1			390.1
Exercise of employee stock options (in shares)			1,268,993
Exercise of employee stock options		23.5		23.5
Stock-based compensation activity, net of withholding for tax (in shares)			114,813
Stock-based compensation activity, net of withholding for tax	[2]	5.4		5.4
Employee 401K match with Vertiv stock (in shares)			16,625
Employee 401K match with Vertiv stock		2.9		2.9
Dividend		(23.9)			(23.9)
Other comprehensive income (loss), net of tax		$ (94.4)				(94.4)
Ending balance (in shares) at Mar. 31, 2026		383,954,111	383,954,111
Ending balance at Mar. 31, 2026		$ 4,244.9	$ 0.0	$ 2,927.0	$ 1,394.1	$ (76.2)

[1] 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.

[2] Net stock compensation activity includes 159,335 vested shares offset by 44,522 shares withheld for taxes valued at $11.6 and stock-based compensation of $17.0.