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, 2023 segment
Subsidiary, Sale of Stock [Line Items]
Number of operating segments | segment			3
Number of reportable segments | segment			3
Payment to Vertiv stockholder | $	$ 341.6
Repayments of long-term debt | $	1,464.0
Business Combination
Subsidiary, Sale of Stock [Line Items]
Consideration transferred | $	$ 1,526.2
Stock consideration transferred (in 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)		69,000,000
Number of units per one redeemable warrant (in 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)		9,000,000
Over-Allotment Option | Warrant
Subsidiary, Sale of Stock [Line Items]
Stock issued (in 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)	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