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Debt - Ark Subordinated Notes Narrative (Details)
1 Months Ended 3 Months Ended
Sep. 08, 2021
USD ($)
Aug. 11, 2021
USD ($)
Jul. 13, 2021
USD ($)
Mar. 31, 2007
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Jul. 13, 2021
EUR (€)
Mar. 31, 2007
EUR (€)
Debt Instrument                      
Debt           $ 575,200,000   $ 420,900,000      
Unsecured Subordinated Debt | Group Ark Insurance Limited                      
Debt Instrument                      
Proceeds from borrowings         $ 157,800,000            
Unsecured Subordinated Debt | Ark | Group Ark Insurance Limited                      
Debt Instrument                      
Notes issued         $ 163,300,000            
Ark 2007 Notes, Tranche 1 | Ark Subordinated Notes                      
Debt Instrument                      
Long-term debt, gross           30,000,000.0          
Ark 2021 Notes Tranche 1                      
Debt Instrument                      
Long-term debt, gross | €             € 39,100,000        
Ark 2021 Notes Tranche 1 | Ark Subordinated Notes                      
Debt Instrument                      
Long-term debt, gross           41,300,000   44,200,000      
Ark 2021 Notes Tranche 1 | Unsecured Subordinated Debt | Group Ark Insurance Limited                      
Debt Instrument                      
Notes issued     $ 46,300,000             € 39,100,000  
Ark 2021 Notes Tranche 1 | Unsecured Subordinated Debt | EURIBOR | Group Ark Insurance Limited                      
Debt Instrument                      
Basis spread on variable rate     5.75%                
Ark 2021 Notes Tranche 2 | Ark Subordinated Notes                      
Debt Instrument                      
Long-term debt, gross           47,000,000.0   47,000,000.0      
Ark 2021 Notes Tranche 2 | Unsecured Subordinated Debt | Group Ark Insurance Limited                      
Debt Instrument                      
Notes issued   $ 47,000,000                  
Ark 2021 Notes Tranche 2 | Unsecured Subordinated Debt | United States Dollar London Interbank Offered Rate LIBOR | Group Ark Insurance Limited                      
Debt Instrument                      
Basis spread on variable rate   5.75%                  
Ark 2021 Notes Tranche 3 | Ark Subordinated Notes                      
Debt Instrument                      
Long-term debt, gross           70,000,000.0   70,000,000.0      
Ark 2021 Notes Tranche 3 | Unsecured Subordinated Debt | Group Ark Insurance Limited                      
Debt Instrument                      
Notes issued $ 70,000,000                    
Additional interest rate 1.00%                    
Solvency capital requirement 120.00%                    
Debt to capital requirement 40.00%                    
Ark 2021 Notes Tranche 3 | Unsecured Subordinated Debt | United States Dollar London Interbank Offered Rate LIBOR | Group Ark Insurance Limited                      
Debt Instrument                      
Basis spread on variable rate 6.10%                    
Ark | Ark 2007 Notes, Tranche 1 | Junior Notes                      
Debt Instrument                      
Long-term line of credit       $ 30,000,000              
Debt           $ 30,000,000          
Ark | Ark 2007 Notes, Tranche 1 | Junior Notes | United States Dollar London Interbank Offered Rate LIBOR                      
Debt Instrument                      
Basis spread on variable rate       4.60%              
Ark | Ark 2007 Notes, Tranche 2 | Junior Notes                      
Debt Instrument                      
Long-term line of credit | €                     € 12,000,000
Debt               $ 13,500,000 € 12,000,000    
Ark | Ark 2007 Notes, Tranche 2 | Junior Notes | EURIBOR                      
Debt Instrument                      
Basis spread on variable rate       4.60%