The company reports its financial results in accordance with U.S. GAAP. However, management believes that certain non-GAAP measures, that reflect the way management evaluates the business, may provide investors with additional information regarding the company's results, trends and ongoing performance on a comparable basis. Specifically, investors should consider the following with respect to our quarterly results:
Net sales and Segment Operating Profit, as adjusted to currency neutral: Net sales and Segment Operating Profit are on a currency neutral basis.
Free Cash Flow: Free cash flow is defined as net cash provided by operating activities adjusted for capital spending and certain items excluded for comparison to prior year periods. The certain item excluded for the twelve months ended December 31, 2013 and 2012, relates to the tax payments resulting from the licensing agreements with PepsiCo and Coca-Cola.
Core Earnings: Core Earnings is defined as Reported Earnings adjusted for the unrealized mark-to-market impact of commodity derivatives and certain items that are excluded for comparison to prior year periods. The certain items excluded for the three and twelve months ended December 31, 2013 are (i) separation-related charges, primarily the completion of the IRS audit, a separation-related foreign deferred tax charge and the associated impacts under the Tax Indemnity Agreement with Mondelēz, (ii) an adjustment to a previously disclosed legal provision, (iii) restructuring charges and (iv) a non-cash charge related to our intention to withdraw from a multi-employer pension plan. The certain items excluded for the three and twelve months ended December 31, 2012 are (i) a separation-related foreign deferred tax benefit and (ii) a depreciation adjustment associated with the reassessment of a capital lease executed prior to the separation from Cadbury.
The tables on the following pages provide these reconciliations.