Other	9 Months Ended
Other	Sep. 30, 2014
Debt Disclosure [Abstract]
Debt Disclosure	Debt At September 30, 2014, short-term debt consisted entirely of securities lending agreements. We had no amount outstanding on our revolving credit facility at September 30, 2014. In May 2014, we purchased and retired $145.0 million principal of our outstanding 6.85% notes, including a make-whole amount of $13.2 million, for a total cost of $158.2 million. In conjunction with this retirement, we reclassified $13.1 million of the deferred gain on previously terminated derivatives associated with the hedge of this debt from accumulated other comprehensive income to realized investment gain in our consolidated statements of income. In March 2014, we issued $350.0 million of unsecured 10-year senior notes in a public offering. The notes have an annual coupon rate of 4.00%. During the nine months ended September 30, 2014, we made principal payments of $35.2 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC. In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured non-recourse notes issued by Tailwind Holdings, LLC, resulting in a before-tax gain of $4.0 million.
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Tax During the third quarter of 2013, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 23 percent to 21 percent effective April 2014 and to 20 percent effective April 2015. Deferred tax assets and liabilities are adjusted through income on the date of enactment of a rate change, and we therefore recorded a reduction of $6.3 million in our income tax expense in the third quarter of 2013.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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