Income from operations The following table presents income from operations by segment, in dollars and as a percentage of net sales, and the year-over-year percentage change in income from operations for the years ended December 31, 2014 and 2013:
## Table 0 ##
* Not meaningful (1) Segment income (loss) from operations includes the segment’s direct operating income (loss) and allocations for Headquarters’ costs, allocations for income and expenses from logistics services, certain inventory adjustments and volume rebates and cooperative advertising from vendors.
(2) Includes certain Headquarters’ function costs that are not allocated to the segments.
Income from operations was $673.0 million in 2014, an increase of $164.4 million, or 32.3%, compared to $508.6 million in 2013.
The increase in income from operations was driven by higher net sales and gross profit and the absence of IPO-related costs.
Total operating margin percentage increased 90 basis points to 5.6% in 2014, from 4.7% in 2013.
Operating margin percentage benefited from the decrease in selling and administrative expenses as a percentage of net sales, which was driven by the absence of $74.3 million in costs related to our IPO in 2013, and was partially offset by a decrease in gross profit margin.
Corporate segment income from operations was $439.8 million in 2014, an increase of $76.5 million, or 21.1%, compared to $363.3 million in 2013.
This increase was primarily driven by higher net sales and gross profit.
Corporate segment operating margin percentage increased 70 basis points to 6.8% in 2014, from 6.1% in 2013.
Operating margin percentage benefited from the decrease in selling and administrative expenses as a percentage of net sales, which was driven by the absence of costs related to our IPO in 2013, and was partially offset by a decrease in gross profit margin.
Public segment income from operations was $313.2 million in 2014, an increase of $66.7 million, or 27.1%, compared to $246.5 million in 2013.
This increase was primarily driven by higher net sales and gross profit.
Public segment operating margin percentage increased 50 basis points to 6.4% in 2014, from 5.9% in 2013.
Operating margin percentage benefited from the decrease in selling and administrative expenses as a percentage of net sales, which was driven by the absence of costs related to our IPO in 2013, and was partially offset by a decrease in gross profit margin.
Interest expense, net At December 31, 2014, our outstanding long-term debt totaled $3,190.0 million, compared to $3,251.2 million at December 31, 2013.
We reduced our long-term debt during 2014 through refinancing activities to redeem our higher interest debt.
Net interest expense in 2014 was $197.3 million, a decrease of $52.8 million compared to $250.1 million in 2013.
This decrease was primarily due to lower debt balances and effective interest rates for 2014 compared to 2013 as a result of debt repayments and refinancing activities completed during 2014 and 2013.
See "Liquidity and Capital Resources" below for a description of the significant debt refinancings in 2014.
Net loss on extinguishments of long-term debt During 2014, we recorded a net loss on extinguishments of long-term debt of $90.7 million compared to $64.0 million in 2013.
In December 2014, we redeemed $541.4 million aggregate principal amount of the 2019 Senior Notes.
We recorded a loss on extinguishment of debt of $36.9 million, representing the difference between the redemption price and the net carrying amount of the purchased debt, adjusted for a portion of the unamortized deferred financing costs and unamortized premium
## Table 1 ##
(1) Includes future principal and cash interest payments on long-term borrowings through scheduled maturity dates.
Interest payments for variable rate debt were calculated using interest rates as of December 31, 2014.
Excluded from these amounts are the amortization of debt issuance and other costs related to indebtedness.
(2) Includes future principal and cash interest payments on long-term borrowings through scheduled maturity dates.
Interest on the Senior Notes is calculated using the stated interest rates.
Excluded from these amounts are the amortization of debt issuance and other costs related to indebtedness.
(3) Includes the minimum lease payments for non-cancelable leases of properties and equipment used in our operations.
Additionally, included in these amounts are future minimum lease payments commencing in the fourth quarter of 2016 that relate to a new lease entered into in December 2014 for our future headquarters in Lincolnshire, Illinois.
Also reflected in these amounts is the future expiration of two leases in the first quarter of 2016 for facilities currently in use by us which we plan to consolidate into the new headquarters location and accordingly, these leases will not be renewed.
(4) Represent commitments to return property subject to operating leases to original condition upon lease termination.
Off-Balance Sheet Arrangements We have no off-balance sheet arrangements that have or are reasonably likely to have a material current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.
Inflation Inflation has not had a material impact on our operating results.
We generally have been able to pass along price increases to our customers, though certain economic factors and technological advances in recent years have tended to place downward pressure on pricing.
We also have been able to generally offset the effects of inflation on operating costs by continuing to emphasize productivity improvements and by accelerating our overall cash conversion cycle.
There can be no assurances, however, that inflation would not have a material impact on our sales or operating costs in the future.
Commitments and Contingencies The information set forth in Note 14 to the accompanying audited consolidated financial statements included in Part II, Item 8 of this Form 10-K is incorporated herein by reference.
Critical Accounting Policies and Estimates The preparation of financial statements in accordance with GAAP requires management to make use of certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods.
We base our estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources.
Actual results could differ from those estimates.
In Note 1 to the accompanying audited consolidated financial statements, we include a discussion of the significant accounting policies used in the preparation of our consolidated financial statements.
We believe the following are the most critical accounting policies and estimates that include significant judgments used in the preparation of our financial statements.
We consider an accounting policy or estimate to be critical if it requires assumptions to be made that were uncertain at the time they were made, and if changes in these assumptions could have a material impact on our financial condition or results of operations.
Year Ended December 31, 2014 Compared to Year Ended December 31, 2013 Results of operations, in dollars and as a percentage of net sales, for the years ended December 31, 2014 and 2013 are as follows:
## Table 2 ##
Net sales Net sales by segment, in dollars and as a percentage of total Net sales, and the year-over-year dollar and percentage change in Net sales for the years ended December 31, 2014 and 2013 are as follows:
## Table 3 ##
(1) There were 254 selling days for the years ended December 31, 2014 and 2013.
Total Net sales in 2014 increased $1,305.9 million, or 12.1%, to $12,074.5 million, compared to $10,768.6 million in 2013.
The increase in total Net sales was primarily the result of continued growth in transactional products driven by notebooks/ mobile devices and desktop computers, as customers across all channels refreshed their client devices and K-12 customers continued to prepare for digital testing requirements, and the addition of more than 140 customer-facing coworkers, the majority in pre- and post-sale technical positions such as technical specialists and service delivery roles.
Growth in solutions-focused products, including netcomm and software, also contributed to the increase in Net sales during 2014.
CDW CORPORATION AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS Deferred Financing Costs Deferred financing costs, such as underwriting, financial advisory, professional fees and other similar fees are capitalized and recognized in Interest expense, net over the estimated life of the related debt instrument using the effective interest method or straight-line method, as applicable.
The Company classifies deferred financing costs as a direct deduction from the carrying value of the long-term debt liability on the Consolidated Balance Sheets, except for deferred financing costs associated with line-of-credit arrangements which are presented as an asset, included within “Other assets” on the Consolidated Balance Sheets.
Derivatives The Company has entered into interest rate cap agreements for the purpose of economically hedging its exposure to fluctuations in interest rates.
These derivatives are recorded at fair value in the Consolidated Balance Sheets.
The Company’s interest rate cap agreements are not designated as cash flow hedges of interest rate risk.
Changes in fair value of the derivatives are recorded directly to Interest expense, net in the Consolidated Statements of Operations.
Fair Value Measurements Fair value is defined under GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
A fair value hierarchy has been established for valuation inputs to prioritize the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market.
Each fair value measurement is reported in one of the three levels which is determined by the lowest level input that is significant to the fair value measurement in its entirety.
These levels are: Level 1 – observable inputs such as quoted prices for identical instruments traded in active markets.
Level 2 – inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability.
The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar techniques.
Accumulated Other Comprehensive Loss Foreign currency translation adjustments are included in Stockholders’ equity under Accumulated other comprehensive loss.
The components of accumulated other comprehensive loss are as follows:

<table><tr><td></td><td colspan="2">Year Ended December 31, 2014</td><td colspan="2">Year Ended December 31, 2013</td><td></td></tr><tr><td></td><td>Dollars inMillions</td><td>OperatingMarginPercentage</td><td>Dollars inMillions</td><td>OperatingMarginPercentage</td><td>Percent Changein Incomefrom Operations</td></tr><tr><td>Segments:<sup>-1</sup></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Corporate</td><td>$439.8</td><td>6.8%</td><td>$363.3</td><td>6.1%</td><td>21.1%</td></tr><tr><td>Public</td><td>313.2</td><td>6.4</td><td>246.5</td><td>5.9</td><td>27.1</td></tr><tr><td>Other</td><td>32.9</td><td>4.6</td><td>27.2</td><td>4.2</td><td>20.9</td></tr><tr><td>Headquarters<sup>-2</sup></td><td>-112.9</td><td>nm*</td><td>-128.4</td><td>nm*</td><td>12.0</td></tr><tr><td>Total income from operations</td><td>$673.0</td><td>5.6%</td><td>$508.6</td><td>4.7%</td><td>32.3%</td></tr></table>
<table><tr><td>(in millions)</td><td colspan="5">Payments Due by Period</td></tr><tr><td></td><td>Total</td><td>< 1 year</td><td>1-3 years</td><td>4-5 years</td><td>> 5 years</td></tr><tr><td>Term Loan<sup>-1</sup></td><td>$1,767.8</td><td>$64.4</td><td>$127.3</td><td>$125.3</td><td>$1,450.8</td></tr><tr><td>Senior Notes due 2019<sup>-2</sup></td><td>696.6</td><td>42.8</td><td>85.7</td><td>568.1</td><td>—</td></tr><tr><td>Senior Notes due 2022<sup>-2</sup></td><td>889.0</td><td>37.0</td><td>72.0</td><td>72.0</td><td>708.0</td></tr><tr><td>Senior Notes due 2024<sup>-2</sup></td><td>891.3</td><td>31.6</td><td>63.3</td><td>63.3</td><td>733.1</td></tr><tr><td>Operating leases<sup>-3</sup></td><td>127.5</td><td>19.1</td><td>31.4</td><td>26.4</td><td>50.6</td></tr><tr><td>Asset retirement obligations<sup>-4</sup></td><td>0.5</td><td>—</td><td>0.5</td><td>—</td><td>—</td></tr><tr><td>Total</td><td>$4,372.7</td><td>$194.9</td><td>$380.2</td><td>$855.1</td><td>$2,942.5</td></tr></table>
<table><tr><td></td><td colspan="2">Year Ended December 31, 2014</td><td colspan="2">Year Ended December 31, 2013</td></tr><tr><td></td><td>Dollars inMillions</td><td>Percentage ofNet Sales</td><td>Dollars inMillions</td><td>Percentage ofNet Sales</td></tr><tr><td>Net sales</td><td>$12,074.5</td><td>100.0%</td><td>$10,768.6</td><td>100.0%</td></tr><tr><td>Cost of sales</td><td>10,153.2</td><td>84.1</td><td>9,008.3</td><td>83.7</td></tr><tr><td>Gross profit</td><td>1,921.3</td><td>15.9</td><td>1,760.3</td><td>16.3</td></tr><tr><td>Selling and administrative expenses</td><td>1,110.3</td><td>9.2</td><td>1,120.9</td><td>10.4</td></tr><tr><td>Advertising expense</td><td>138.0</td><td>1.1</td><td>130.8</td><td>1.2</td></tr><tr><td>Income from operations</td><td>673.0</td><td>5.6</td><td>508.6</td><td>4.7</td></tr><tr><td>Interest expense, net</td><td>-197.3</td><td>-1.6</td><td>-250.1</td><td>-2.3</td></tr><tr><td>Net loss on extinguishments of long-term debt</td><td>-90.7</td><td>-0.8</td><td>-64.0</td><td>-0.6</td></tr><tr><td>Other income, net</td><td>2.7</td><td>—</td><td>1.0</td><td>—</td></tr><tr><td>Income before income taxes</td><td>387.7</td><td>3.2</td><td>195.5</td><td>1.8</td></tr><tr><td>Income tax expense</td><td>-142.8</td><td>-1.2</td><td>-62.7</td><td>-0.6</td></tr><tr><td>Net income</td><td>$244.9</td><td>2.0%</td><td>$132.8</td><td>1.2%</td></tr></table>
<table><tr><td></td><td colspan="4">Years Ended December 31,</td><td></td><td></td></tr><tr><td></td><td colspan="2">2014</td><td colspan="2">2013</td><td></td><td></td></tr><tr><td>(dollars in millions)</td><td>Net Sales</td><td>Percentageof Total Net sales</td><td>Net Sales</td><td>Percentageof Total Net Sales</td><td>DollarChange</td><td>PercentChange<sup>-1</sup></td></tr><tr><td>Corporate:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Medium / Large</td><td>$5,485.4</td><td>45.4%</td><td>$5,052.7</td><td>46.9%</td><td>$432.7</td><td>8.6%</td></tr><tr><td>Small Business</td><td>990.1</td><td>8.2</td><td>907.4</td><td>8.4</td><td>82.7</td><td>9.1</td></tr><tr><td>Total Corporate</td><td>6,475.5</td><td>53.6</td><td>5,960.1</td><td>55.3</td><td>515.4</td><td>8.6</td></tr><tr><td>Public:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Government</td><td>1,449.4</td><td>12.0</td><td>1,250.6</td><td>11.6</td><td>198.8</td><td>15.9</td></tr><tr><td>Education</td><td>1,824.0</td><td>15.1</td><td>1,449.0</td><td>13.5</td><td>375.0</td><td>25.9</td></tr><tr><td>Healthcare</td><td>1,606.0</td><td>13.3</td><td>1,464.9</td><td>13.6</td><td>141.1</td><td>9.6</td></tr><tr><td>Total Public</td><td>4,879.4</td><td>40.4</td><td>4,164.5</td><td>38.7</td><td>714.9</td><td>17.2</td></tr><tr><td>Other</td><td>719.6</td><td>6.0</td><td>644.0</td><td>6.0</td><td>75.6</td><td>11.7</td></tr><tr><td>Total Net sales</td><td>$12,074.5</td><td>100.0%</td><td>$10,768.6</td><td>100.0%</td><td>$1,305.9</td><td>12.1%</td></tr></table>

Question: What is the difference between 2014 and 2013 's highest Dollars? (in Million)
Answer: 1305.9