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Reinsurance and Indemnification - North Carolina Reinsurance Facility (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Retention Policy [Line Items]        
Premiums earned   $ 36,513.0 $ 34,678.0 $ 33,582.0
Recoverables   7,155.0    
North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Funds Deficit in Member's equity $ 215.0      
Net income 95.0      
Premiums earned 1,100.0      
Paid   9.8    
Recoverables   $ 76.4    
Private Passenger Auto Risk Recoupment | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Premiums earned 206.0      
Member Loss Recoupments | North Carolina Reinsurance Facility        
Reinsurance Retention Policy [Line Items]        
Premiums earned $ 228.0