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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 59,250 $ 44,067 $ 100,922 $ 63,090
Operating segments | Insurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 4,000 $ 2,500 $ 8,100 $ 3,600
Percentage of prior year development 0.50% 0.40% 0.50% 0.30%
Operating segments | Insurance | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   $ 11,500 $ 49,400 $ 15,400
Operating segments | Insurance | Short tailed lines | Property excluding marine        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 7,100 7,500 21,600 9,600
Operating segments | Insurance | Short tailed lines | Travel and accident        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 6,700 3,500 9,300  
Operating segments | Insurance | Short tailed lines | Lenders products        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 10,700   18,600 3,100
Operating segments | Insurance | Medium tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (24,500) (17,100) (45,400) (25,100)
Operating segments | Insurance | Medium tailed lines | Programs        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   (4,000) (12,600) (6,300)
Operating segments | Insurance | Medium tailed lines | Professional liability        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   (6,300) (11,200)  
Operating segments | Insurance | Medium tailed lines | Contract binding        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (20,100) (6,100) (20,100) (19,300)
Operating segments | Insurance | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   8,100   13,300
Operating segments | Insurance | Long tailed lines | Construction and national accounts        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 5,600      
Operating segments | Insurance | Long tailed lines | Executive assurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   2,400    
Operating segments | Insurance | Long tailed lines | Other product lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   4,900   7,600
Operating segments | Insurance | Short tailed and long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 28,500 19,700 53,500 28,700
Operating segments | Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 20,500 $ 40,200 $ 47,300 $ 51,800
Percentage of prior year development 2.80% 8.40% 3.40% 5.10%
Operating segments | Reinsurance | Short tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   $ 46,200 $ 67,200 $ 65,700
Operating segments | Reinsurance | Short tailed lines | Property catastrophe and property other than property catastrophe        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   18,300 28,800  
Operating segments | Reinsurance | Short tailed lines | Property catastrophe        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ (17,100)   (39,600) 21,300
Operating segments | Reinsurance | Short tailed lines | Other specialty lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 61,600 27,500 78,200 39,300
Operating segments | Reinsurance | Medium tailed lines | Marine and aviation        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 4,000      
Operating segments | Reinsurance | Long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (33,200)   (24,800) (15,600)
Operating segments | Reinsurance | Long tailed lines | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) (34,200) (5,800)    
Operating segments | Reinsurance | Short tailed and medium tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) 53,700   72,100 67,400
Operating segments | Reinsurance | Medium tailed and long tailed lines        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable)   (6,000)    
Operating segments | Mortgage        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ 43,100 $ 200 $ 54,000 $ 6,300
Percentage of prior year development 12.90% 0.10% 8.10% 0.90%
Operating segments | Other        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Prior year development favorable (unfavorable) $ (8,300) $ 1,100 $ (8,400) $ 1,300