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Related Party Transactions - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 20, 2022
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
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   $ 174.8 $ 208.9    
Amounts due to The Fidelis Partnership   $ 457.7 385.8    
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%      
Other receivables   $ 174.8 208.9    
Amounts due to The Fidelis Partnership   457.7 385.8    
Insurance commissions   115.9 104.8 $ 54.4  
Payments for commissions   27.5 68.6 31.6  
Framework Agreement | Related Party | Policy Acquisition Expenses          
Related Party Transaction [Line Items]          
Insurance commissions   53.4 51.6 15.9  
Framework Agreement | Related Party | General and Administrative Expense          
Related Party Transaction [Line Items]          
Costs and expenses, related party   $ 4.5 $ 6.5 $ 5.6  
Framework Agreement | Related Party | Third Party Managing General Underwriters          
Related Party Transaction [Line Items]          
Reinsurance, ceded commission, percentage   0.030      
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%