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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Sep. 03, 2024
Jul. 25, 2024
Jul. 23, 2024
Jun. 30, 2024
Dec. 31, 2023
Subsequent Event [Line Items]          
Newly issued common LLC units       80,324,378 79,300,658
Options granted       9,097,000  
Subsequent Event          
Subsequent Event [Line Items]          
Payment of expenses $ 2.8        
Payment of expenses remained unpaid $ 3.9        
Subsequent Event | KKR          
Subsequent Event [Line Items]          
Percentage of outstanding common stock to be held   5.00%      
Subsequent Event | Maximum | KKR          
Subsequent Event [Line Items]          
Percentage of ownership interest   40.00%      
Subsequent Event | Minimum | KKR          
Subsequent Event [Line Items]          
Percentage of ownership interest   10.00%      
Percentage of ownership interest change in control   25.00%      
Subsequent Event | OneStream, Inc | Initial Public Offering          
Subsequent Event [Line Items]          
Net proceeds from IPO   $ 409.6      
Net proceeds from LLC units   $ 352.9      
Newly issued common LLC units   18,723,296      
Shares issued and outstanding LLC units   3,006,037      
Purchase of issued and outstanding LLC units   $ 56.7      
Number of outstanding units issued in transaction     8,632,763    
Underwriting discounts and commissions   $ 25.0      
Reclassified number of units issued in transaction     6,591,178    
Number of units held   160,256,358      
Ownership interest   68.40%      
Percentage of tax savings available to pay   15.00%      
Percentage of realized tax savings   85.00%      
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock          
Subsequent Event [Line Items]          
Number of shares issued in transaction   21,729,333      
Price per share   $ 0.0001      
Public offering price   $ 20      
Net proceeds from IPO   $ 409.6      
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | 2024 Equity Incentive Plan [Member]          
Subsequent Event [Line Items]          
Common stock reserved for future issuance   32,100,000      
Options granted   2,413,968      
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | 2024 Employee Stock Purchase Plan [Member]          
Subsequent Event [Line Items]          
Common stock reserved for future issuance   10,700,000      
Subsequent Event | OneStream, Inc | Initial Public Offering | Class A common stock | Existing Stockholders          
Subsequent Event [Line Items]          
Number of shares issued in transaction   6,445,667      
Public offering price   $ 20