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Insurance Operations - Historical Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.00%
Year 2 19.00%
Year 3 15.00%
Year 4 13.00%
Year 5 10.00%
Year 6 7.00%
Year 7 7.00%
Year 8 3.00%
Year 9 3.00%
Year 10 2.00%
Commercial Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 23.00%
Year 2 22.00%
Year 3 19.00%
Year 4 17.00%
Year 5 12.00%
Year 6 1.00%
Year 7 6.00%
Year 8 $ (2.00)
General Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.00%
Year 2 12.00%
Year 3 15.00%
Year 4 16.00%
Year 5 14.00%
Year 6 13.00%
Year 7 10.00%
Year 8 6.00%
Year 9 4.00%
Year 10 3.00%
Workers' Compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 8.00%
Year 2 14.00%
Year 3 10.00%
Year 4 9.00%
Year 5 6.00%
Year 6 7.00%
Year 7 4.00%
Year 8 4.00%
Year 9 3.00%
Year 10 4.00%
Commercial Multiple Peril  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 14.00%
Year 2 17.00%
Year 3 10.00%
Year 4 28.00%
Year 5 25.00%
Year 6 11.00%
All Other Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 33.00%
Year 2 39.00%
Year 3 20.00%
Year 4 2.00%
Year 5 2.00%
Year 6 2.00%
Year 7 7.00%