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Description of Business - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 07, 2020
USD ($)
$ / shares
shares
Jun. 12, 2018
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
segments
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
shares
Subsidiary, Sale of Stock [Line Items]          
Number of operating segments | segments     3    
Number of reportable segments | segments     3    
Common stock, shares outstanding (in shares)     328,411,705   118,261,955
Payment to Vertiv stockholder | $ $ 341.6   $ 341.6 $ 0.0  
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      
Stock issued price (USD per share) | $ / shares   $ 10.00      
Consideration received on sale of stock, before issuance costs | $   $ 690.0      
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