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Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details)	Dec. 31, 2018
Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	16.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	25.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	16.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	11.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	7.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	5.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	5.10%
Reinsurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	13.90%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	27.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	16.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	8.90%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	7.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	5.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	3.30%

X

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Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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