company’s position in broader snacking. The acquisition added incremental net revenues of $106 million and operating income of $6 million in the three months ended March 31, 2021. The company incurred $1 million of acquisition-integrations costs in the three months ended March 31, 2021.The company also incurred acquisition-related costs of $5 million in the three months ended March 31, 2020.
Simplify to Grow Program
The primary objective of the Simplify to Grow Program is to reduce the company’s operating cost structure in both its supply chain and overhead costs. The program covers severance as well as asset disposals and other manufacturing and procurement-related one-time costs.
Restructuring costs
The company recorded restructuring charges of $88 million in the three months ended March 31, 2021 and $15 million in the three months ended March 31, 2020 within asset impairment and exit costs and benefit plan non-service income. These charges were for severance and related costs, non-cash asset write-downs (including accelerated depreciation and asset impairments) and other adjustments, including any gains on sale of restructuring program assets.
Implementation costs
Implementation costs primarily relate to reorganizing the company’s operations and facilities in connection with its supply chain reinvention program and other identified productivity and cost saving initiatives. The costs include incremental expenses related to the closure of facilities, costs to terminate certain contracts and the simplification of the company’s information systems. The company recorded implementation costs of $34 million in the three months ended March 31, 2021 and $43 million in the three months ended March 31, 2020.
Mark-to-market impacts from commodity and currency derivative contracts
The company excludes unrealized gains and losses (mark-to-market impacts) from outstanding commodity and forecasted currency transaction derivatives from its non-GAAP earnings measures until such time that the related exposures impact its operating results. The company recorded net unrealized gains on commodity and forecasted currency transaction derivatives of $117 million in the three months ended March 31, 2021 and recorded net unrealized losses of $184 million in the three months ended March 31, 2020.
Remeasurement of net monetary position
During the second quarter of 2018, primarily based on published estimates which indicated that Argentina’s three-year cumulative inflation rate exceeded 100%, the company concluded that Argentina became a highly inflationary economy for accounting purposes. As of July 1, 2018, the company began to apply highly inflationary accounting for its Argentinian subsidiaries and changed their functional currency from the Argentinian peso to the U.S. dollar. On July 1, 2018, both monetary and non-monetary assets and liabilities denominated in Argentinian pesos were remeasured into U.S. dollars. As of each subsequent balance sheet date, Argentinian peso denominated monetary assets and liabilities were remeasured into U.S. dollars using the exchange rate as of the balance sheet date, with remeasurement and other transaction gains and losses recorded in net earnings. Within selling, general and administrative expenses, the company recorded remeasurement losses of $5 million in the three months ended March 31, 2021 and $2 million in the three months ended March 31, 2020 related to the revaluation of the Argentinian peso denominated net monetary position over these periods.
Impact from pension participation changes
The impact from pension participation changes represent the charges incurred when employee groups are withdrawn from multiemployer pension plans and other changes in employee group pension plan participation. The company excludes these charges from its non-GAAP results because those amounts do not reflect the company’s ongoing pension obligations.
On July 11, 2019, the company received an undiscounted withdrawal liability assessment related to the company’s complete withdrawal from the Bakery and Confectionery Union and Industry International Pension Fund totaling $526 million and requiring pro-rata monthly payments over 20 years. The company began making monthly payments during the third quarter of 2019. The company recorded $3 million of accreted interest in the three months ended March 31, 2021 and $3 million in the three months ended March 31, 2020 on the long-term liability within interest and other expense, net. As of March 31, 2021, the remaining discounted withdrawal liability was $372 million, with $14 million recorded in other current liabilities and $358 million recorded in long-term other liabilities.
Loss on debt extinguishment and related expenses
On March 31, 2021, the company completed an early redemption of Euro (€1,200 million) and U.S. dollar ($992 million) denominated notes. The company recorded $137 million of extinguishment loss and debt-related expenses within interest and other expense, net related to $110 million paid in excess of carrying value of the debt and recognizing unamortized discounts and deferred financing in earnings and $27 million foreign currency derivative loss related to the redemption payment at the time of the debt extinguishment.