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Reinsurance and Indemnification - North Carolina Reinsurance Facility (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reinsurance Retention Policy [Line Items]        
Premiums earned   $ 38,577.0 $ 36,513.0 $ 34,678.0
Recoverables   6,912.0    
North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Funds Deficit in Member's equity $ 110.0      
Net income 105.0      
Premiums earned 1,100.0      
Paid   9.4    
Recoverables   $ 69.1    
Private Passenger Auto Risk Recoupment | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Premiums earned 271.0      
Member Loss Recoupments | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Premiums earned $ 137.0