Other	3 Months Ended
Other	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt Disclosure	Debt At March 31, 2015, short-term debt consisted entirely of our 6.85% notes due in the fourth quarter of 2015. We had no amount outstanding on our revolving credit facility at March 31, 2015. During the three months ended March 31, 2015, we made principal payments of $29.1 million on our senior secured non-recourse notes issued by Northwind Holdings, LLC.
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Tax In the first quarter of 2015, we reached agreement with the Internal Revenue Service on all outstanding issues related to the examinations for 2009 and 2010 tax years and refund claims filed for tax credits related to tax years 2003 through 2012. As a result of this agreement, we reduced our reserve for uncertain tax positions in our consolidated balance sheet by $19.3 million. We also recognized in our consolidated statements of income a reduction in federal income taxes of $5.8 million.

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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