Investments (Policies)	6 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Credit Losses for Available-for-sale Fixed-maturity Securities	Credit Losses for Available-for-sale Fixed-maturity Securities. The Company adopted ASC 326 as of January 1, 2020, which maintains the fundamental incurred probable loss approach for measuring losses in the condensed consolidated statement of income. For an available-for-sale security with an amortized cost that exceeds its fair value, we first determine if we intend to sell or will more-likely-than-not be required to sell the security before the expected recovery of its amortized cost. If we intend to sell or will more-likely-than-not be required to sell the security, then we recognize the impairment as a credit loss in our condensed consolidated statements of income by writing down the security’s amortized cost to its fair value. If we do not intend to sell or it is not more-likely-than-not that we will be required to sell the security before the expected recovery of its amortized cost, we recognize the portion of the impairment that is due to a credit loss, if any, in our condensed consolidated statement of income through an allowance. The portion of the impairment that is due to factors other than a credit loss is recognized in other comprehensive income in the condensed consolidated statement of comprehensive income as an unrealized loss. Credit losses recognized in the allowance for credit losses are reversed in situations where the estimate of credit losses on those securities has declined.  When determining whether an impairment is due to a credit loss or other factors, we determine the extent to which we do not expect to recover the security’s amortized cost and record such amount, if any, as a credit loss. Factors we consider in determining whether the security’s decline in fair value is below amortized cost due to a credit loss include the magnitude of the security’s decline in fair value below its amortized cost, the financial condition, long and near-term prospects for the issuer, industry conditions and trends, rating agency actions, the payment structure of the security, likelihood of the recoverability of principal and interest, and our ability and intent to hold the security for a period of time sufficient to allow for the anticipated recovery of its amortized cost. In assessing our ability and intent to hold the security for a period of time to allow for the anticipated recovery of its amortized cost, we also consider our anticipated sources of cash to fund operating activities and share repurchases. If we do not anticipate recovering a security’s amortized cost basis, we estimate the present value of the security’s expected cash flows and recognize the difference from amortized cost (using fair value as a floor) as a credit loss.