New Accounting Standards	9 Months Ended
New Accounting Standards	Sep. 30, 2020
Accounting Policies [Abstract]
New Accounting Standards	New Accounting Standards — On January 1, 2020, we adopted the Accounting Standards Update (ASU), on a prospective basis, which provides guidance on the requirements for capitalizing and amortizing implementation costs incurred in a cloud computing arrangement that does not include a software license. For the nine months ended September 30, 2020, we capitalized $21.7 million of cloud computing arrangement implementation costs, which is included in other assets on our consolidated balance sheet. On January 1, 2020, we adopted the ASU which amends the disclosure requirements for fair value measurements. The ASU requires companies to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The ASU also removes current disclosure requirements for the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. As permitted by the ASU, we elected to partially early adopt the removal of the then current disclosure requirements in 2018 and adopted the remaining disclosure requirements as of January 1, 2020. As this only affects disclosure requirements, there was no impact on our financial condition, cash flows, or results of operations. On January 1, 2020, we adopted the ASU which eliminates the requirement to determine the implied fair value of goodwill in measuring an impairment loss. The standard requires the measurement of a goodwill impairment to represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. The adoption of this ASU had no impact on our financial condition, cash flows, or results of operations. On January 1, 2020, we adopted the ASU intended to improve the timing, and enhance the accounting and disclosure, of credit losses on financial assets. This update modified the existing accounting guidance related to the impairment evaluation for available-for-sale debt securities and resulted in the creation of an allowance for credit losses as a contra asset account. The ASU requires prospective changes to previously recorded impairments. To determine the existence of any credit-related impairment losses on our available-for-sale debt securities, we reviewed all such securities by applying estimates of future cash flows and performance of those securities in a loss position and identifying market-related versus performance-related losses. For our reinsurance recoverables, we assessed the current credit quality and credit outlook for reinsurers with at-risk uncollateralized recoverables. Based on these analyses, we determined that our allowance for credit losses was not material relative to our available-for-sale debt securities and reinsurance recoverables upon adoption of the ASU. In assessing premium receivables, which are short-term in nature, we assessed customer balances leveraging our current process for analyzing the collectibility of premium receivables. Based on our analysis, no adjustment to the beginning balance of retained earnings was required upon adoption. See Note 1 – Basis of Presentation for changes in the allowance for doubtful accounts related to the premiums receivable balance.