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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended
Dec. 20, 2022
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
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   $ 228.3   $ 208.9  
Amounts due to The Fidelis Partnership   $ 445.8   $ 385.8  
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   $ 29.9 $ 20.2    
Payments for commissions   9.3 7.9    
Framework Agreement | Related Party | Policy Acquisition Expenses          
Related Party Transaction [Line Items]          
Insurance commissions   11.7 15.5    
Framework Agreement | Related Party | General and Administrative Expense          
Related Party Transaction [Line Items]          
Costs and expenses, related party   $ 1.1 $ 1.6    
Framework Agreement | Related Party | Third Party Managing General Underwriters          
Related Party Transaction [Line Items]          
Reinsurance, ceded commission, percentage   0.030      
Group | Framework Agreement | Related Party | Fidelis MGU          
Related Party Transaction [Line Items]          
Subsidiary, ownership percentage, noncontrolling owner         9.90%