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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Description of Business Narrative (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 07, 2020 USD ($) $ / shares shares	Jun. 12, 2018 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Subsidiary, Sale of Stock [Line Items]
Number of operating segments \| segment			3
Number of reportable segments \| segment			3
Payment to Vertiv stockholder	$ 341.6		$ 0.0	$ 0.0	$ 341.6
Repayments of long-term debt	1,464.0
Net sales			5,691.5	4,998.1	4,370.6
Cost of sales			4,075.4	3,475.4	2,896.9
Products
Subsidiary, Sale of Stock [Line Items]
Net sales			4,335.3	3,694.6	3,068.7
Cost of sales			3,219.1	2,699.7	2,154.9
Products \| Restatement Adjustment
Subsidiary, Sale of Stock [Line Items]
Cost of sales				114.8	135.6
Services
Subsidiary, Sale of Stock [Line Items]
Net sales			1,356.2	1,303.5	1,301.9
Cost of sales			$ 856.3	775.7	742.0
Services \| Restatement Adjustment
Subsidiary, Sale of Stock [Line Items]
Net sales				$ 159.9	$ 240.1
Business Combination
Subsidiary, Sale of Stock [Line Items]
Consideration transferred	$ 1,526.2
Stock consideration transferred (in shares) \| shares	118,261,955
Value of stock consideration transferred (USD per share) \| $ / shares	$ 10.00
IPO
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares) \| shares		69,000,000
Number of units per one redeemable warrant (in shares) \| shares		3
Stock issued price (USD per share) \| $ / shares		$ 10.00
Consideration received on sale of stock, before issuance costs		$ 690.0
IPO \| Warrant
Subsidiary, Sale of Stock [Line Items]
Stock issued price (USD per share) \| $ / shares		$ 11.50
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares) \| shares		9,000,000
Over-Allotment Option \| Warrant
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares) \| shares		10,533,333
Stock issued price (USD per share) \| $ / shares		$ 11.50
Private Placement
Subsidiary, Sale of Stock [Line Items]
Stock issued (in shares) \| shares	123,900,000
Stock issued price (USD per share) \| $ / shares		$ 1.50
Consideration received on sale of stock, net of issuance costs	$ 1,239.0	$ 15.8