XML 101 R61.htm IDEA: XBRL DOCUMENT v3.24.3
Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 20, 2022
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2023
USD ($)
Jan. 03, 2023
Related Party Transaction [Line Items]                
Reinsurance, profit commission, percentage       0.200        
Reinsurance, profit commission, hurdle rate of return, percentage       0.050        
Related Party                
Related Party Transaction [Line Items]                
Other receivables   $ 248.5   $ 248.5     $ 173.3  
Amounts due to The Fidelis Partnership   410.7   $ 410.7     $ 334.5  
Framework Agreement | Related Party                
Related Party Transaction [Line Items]                
Related party transaction, agreement duration 10 years              
Reinsurance, ceded commission, percentage       0.115        
Property management fee, percent fee       3.00%        
Insurance commissions   33.7 $ 24.7 $ 76.8 $ 37.3      
Payments for commissions   40.9 12.9 55.0 20.7      
Origination of notes receivable from related parties           $ 4.5    
Framework Agreement | Related Party | Policy Acquisition Expenses                
Related Party Transaction [Line Items]                
Insurance commissions   17.1 4.1 33.6 14.5      
Framework Agreement | Related Party | General and Administrative Expense                
Related Party Transaction [Line Items]                
Costs and expenses, related party   1.6 1.6 4.6 4.3      
Related party transaction, purchases from related party   $ 0.7 $ 0.6 $ 1.1 $ 1.9      
Framework Agreement | Related Party | Third Party Managing General Underwriters                
Related Party Transaction [Line Items]                
Reinsurance, ceded commission, percentage       0.03        
Group | Fidelis MGU                
Related Party Transaction [Line Items]                
Subsidiary, ownership percentage, noncontrolling owner               9.90%
Group | Framework Agreement | Related Party | Fidelis MGU                
Related Party Transaction [Line Items]                
Subsidiary, ownership percentage, noncontrolling owner               9.90%