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Other	6 Months Ended
Other	Jun. 30, 2018
Debt and Other Disclosures [Abstract]
Debt Disclosure	Debt In May 2018, we issued $300.0 million of 6.25% junior subordinated notes due 2058. The notes are redeemable at or above par on or after June 15, 2023 and rank equally in the right of payment with our other junior subordinated debt securities. During the six months ended June 30, 2018, we made principal payments of $30.0 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC. At June 30, 2018, short-term debt consisted entirely of our $200.0 million 7.00% senior unsecured notes, which subsequently matured in July 2018. At June 30, 2018, letters of credit totaling $2.1 million had been issued from the credit facility, but there were no borrowed amounts outstanding. In June 2017, we purchased and retired the remaining $3.4 million of principal on our senior secured floating rate notes acquired through our purchase of Starmount. In conjunction with this retirement, we also terminated the interest rate swap associated with the hedge of these notes and recorded a $0.1 million loss in our consolidated statements of income as a component of net realized investment gains and losses. See Note 5 for further discussion.
Income Tax Disclosure	Income Tax On December 22, 2017, the U.S. Federal government enacted the TCJA, which reduces the federal corporate tax rate from 35 percent to 21 percent effective January 1, 2018. We are applying the guidance in Staff Accounting Bulletin (SAB) 118 when accounting for the enactment-date effects of TCJA. At June 30, 2018, our estimates recorded at December 31, 2017 for the tax effects of TCJA are not final and we have not recorded any adjustments related to those estimates during the first six months of 2018. We will continue to refine our calculations as additional analysis is completed and record the final amounts during the one year measurement period after the enactment date as allowed by SAB 118. Tax rate estimates recorded at December 31, 2017 and June 30, 2018 may be impacted by changes in accounting and tax interpretations of the TCJA legislation.