v3.19.3
Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2019
Sep. 30, 2019
James River Group | Restricted cash and cash equivalents    
Subsequent Event [Line Items]    
Funds held in trust as collateral   $ 1,200
Subsequent Event | Cornershop    
Subsequent Event [Line Items]    
Consideration transferred $ 459  
Subsequent Event | Cornershop | Tranche One    
Subsequent Event [Line Items]    
Consideration transferred $ 50