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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2020
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 $ 222.1     $ 173.3  
Amounts due to The Fidelis Partnership $ 334.6     $ 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 $ 20.2 $ 2.8      
Payments for commissions 7.9 0.0      
Origination of notes receivable from related parties     $ 4.5    
Framework Agreement | Related Party | Policy Acquisition Expenses          
Related Party Transaction [Line Items]          
Insurance commissions 15.5 8.9      
Framework Agreement | Related Party | General and Administrative Expense          
Related Party Transaction [Line Items]          
Costs and expenses, related party 1.6 1.4      
Related party transaction, purchases from related party $ 0.3 $ 0.5      
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%