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Reserve for Losses and Loss Adjustment Expenses - Prior years reserve development (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (163,585) $ (272,712) $ (237,982)
Other      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 23,800 (2,200) 31,000
Underwriting segments | Reinsurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (46,400) $ (138,500) $ (165,400)
Prior year reserve development (points) 3.20% 11.00% 14.50%
Underwriting segments | Reinsurance | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (70,500) $ (110,400) $ (101,000)
Underwriting 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 reserve development favorable (unfavorable) (33,700) (80,800) (82,600)
Underwriting 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 reserve development favorable (unfavorable) (40,800)    
Underwriting 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 reserve development favorable (unfavorable)   (28,100) (64,400)
Underwriting segments | Reinsurance | Medium-tailed and long-tailed lines | Casualty      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (12,500) (43,700)
Underwriting segments | Reinsurance | Medium-tailed and long-tailed lines | Marine and aviation      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (15,600) (19,600)
Underwriting segments | Reinsurance | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 40,100    
Underwriting segments | Reinsurance | Long-tailed lines | Casualty      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 44,500    
Underwriting segments | Reinsurance | Medium-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) (16,000)    
Underwriting segments | Insurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (15,800) $ (24,400) $ (8,600)
Prior year reserve development (points) 7.00% 1.10% 4.00%
Underwriting segments | Insurance | Short-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (54,900) $ (48,400) $ (14,900)
Underwriting segments | Insurance | Short-tailed lines | Property      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (50,100) (22,800)
Underwriting segments | Insurance | Short-tailed lines | Travel, accident and health      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   5,000 11,800
Underwriting segments | Insurance | Medium-tailed and long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 39,100    
Underwriting segments | Insurance | Medium-tailed and long-tailed lines | Programs      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 30,100    
Underwriting segments | Insurance | Medium-tailed and long-tailed lines | Professional liability      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) (19,300)    
Underwriting segments | Insurance | Medium-tailed and long-tailed lines | Surety      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) (15,800)    
Underwriting segments | Insurance | Medium-tailed and long-tailed lines | Contract binding      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) 33,600    
Underwriting segments | Insurance | Long-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (26,300) (11,800)
Underwriting segments | Insurance | Long-tailed lines | Casualty      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (1,400) (8,300)
Underwriting segments | Insurance | Long-tailed lines | Executive assurance      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   (19,700) (10,000)
Underwriting segments | Insurance | Long-tailed lines | Professional liability      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)     (36,200)
Underwriting segments | Insurance | Medium-tailed lines      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   50,300 18,100
Underwriting segments | Insurance | Medium-tailed lines | Programs      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)     56,300
Underwriting segments | Insurance | Medium-tailed lines | Contract binding      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable)   50,300  
Underwriting segments | Mortgage      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (125,200) $ (107,600) $ (95,000)
Prior year reserve development (points) 9.20% 9.10% 9.00%
Underwriting segments | Mortgage | Primary mortgage business      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Prior year reserve development favorable (unfavorable) $ (117,100) $ (103,400) $ (89,300)