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Retirement Plans and Postretirement Medical Benefits | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Pensions and Other Benefit Programs | Retirement Plans and Postretirement Medical Benefits We provide certain retirement benefits to our U.S. employees hired prior to January 1, 2005 and to eligible employees outside the U.S. under various defined benefit retirement plans. Benefit accruals under most of our defined benefit plans, including our two largest U.S. pension plans, our U.K. pension plans and Canadian pension plans, have been frozen. We also provide certain employer subsidized health care and employer provided life insurance benefits in the U.S. and Canada to eligible retirees and their dependents. Employees hired before January 1, 2005 in the U.S. and April 1, 2005 in Canada become eligible for retiree medical benefits after reaching age 55 and with the completion of the required service period. The cost of these benefits is recognized over the period the employee provides credited service to the company. Retirement Plans The benefit obligations and funded status of defined benefit pension plans are as follows:
| United States |  | Foreign
| 2015 |  | 2014 |  | 2015 |  | 2014
Accumulated benefit obligation | $ | 1,688,982 |  |  | $ | 1,866,914 |  |  | $ | 635,600 |  |  | $ | 698,176 |
Projected benefit obligation |  |  |  |  |  |  |
Benefit obligation - beginning of year | $ | 1,868,176 |  |  | $ | 1,622,591 |  |  | $ | 715,287 |  |  | $ | 672,773 |
Service cost | 134 |  |  | 6,908 |  |  | 2,229 |  |  | 3,565 |
Interest cost | 74,331 |  |  | 77,655 |  |  | 24,261 |  |  | 28,518 |
Plan participants' contributions | — |  |  | — |  |  | 8 |  |  | 59 |
Actuarial (gain) loss | (131,179 | ) |  | 306,718 |  |  | (15,375 | ) |  | 89,695 |
Foreign currency changes | — |  |  | — |  |  | (53,945 | ) |  | (52,750 | )
Plan Amendments | (428 | ) |  | — |  |  | — |  |  | — |
Settlement / curtailment | (3,678 | ) |  | (16,867 | ) |  | — |  |  | — |
Special termination benefits | — |  |  | — |  |  | 79 |  |  | 1,238 |
Benefits paid | (117,471 | ) |  | (128,829 | ) |  | (25,432 | ) |  | (27,811 | )
Benefit obligation - end of year | $ | 1,689,885 |  |  | $ | 1,868,176 |  |  | $ | 647,112 |  |  | $ | 715,287 |
Fair value of plan assets available for benefits |  |  |  |  |  |  |
Fair value of plan assets - beginning of year | $ | 1,593,463 |  |  | $ | 1,523,679 |  |  | $ | 574,992 |  |  | $ | 561,078 |
Actual return on plan assets | (19,173 | ) |  | 195,946 |  |  | 11,383 |  |  | 67,306 |
Company contributions | 7,649 |  |  | 19,534 |  |  | 14,194 |  |  | 15,323 |
Plan participants' contributions | — |  |  | — |  |  | 8 |  |  | 59 |
Settlement / curtailment | (3,678 | ) |  | (16,867 | ) |  | — |  |  | — |
Foreign currency changes | — |  |  | — |  |  | (45,033 | ) |  | (40,963 | )
Benefits paid | (117,471 | ) |  | (128,829 | ) |  | (25,432 | ) |  | (27,811 | )
Fair value of plan assets - end of year | $ | 1,460,790 |  |  | $ | 1,593,463 |  |  | $ | 530,112 |  |  | $ | 574,992 |
Amounts recognized in the Consolidated Balance Sheets |  |  |  |  |  |  |
Non-current asset | $ | 271 |  |  | $ | 300 |  |  | $ | 11,566 |  |  | $ | 5,813 |
Current liability | (9,088 | ) |  | (6,590 | ) |  | (1,031 | ) |  | (1,008 | )
Non-current liability | (220,277 | ) |  | (268,423 | ) |  | (127,535 | ) |  | (145,100 | )
Funded status | $ | (229,094 | ) |  | $ | (274,713 | ) |  | $ | (117,000 | ) |  | $ | (140,295 | )
Information provided in the table below is only for pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2015 and 2014:
| United States |  | Foreign
| 2015 |  | 2014 |  | 2015 |  | 2014
Projected benefit obligation | $ | 1,689,476 |  |  | $ | 1,867,788 |  |  | $ | 540,984 |  |  | $ | 583,317 |
Accumulated benefit obligation | $ | 1,688,573 |  |  | $ | 1,866,525 |  |  | $ | 529,593 |  |  | $ | 566,365 |
Fair value of plan assets | $ | 1,460,111 |  |  | $ | 1,592,774 |  |  | $ | 412,418 |  |  | $ | 437,209 |
Pretax amounts recognized in AOCI consist of: |  |  |  |  |  |  |
| United States |  | Foreign
| 2015 |  | 2014 |  | 2015 |  | 2014
Net actuarial loss | $ | 880,123 |  |  | $ | 918,641 |  |  | $ | 255,994 |  |  | $ | 253,257 |
Prior service credit | (512 | ) |  | (144 | ) |  | (740 | ) |  | (806 | )
Transition asset | — |  |  | — |  |  | (40 | ) |  | (49 | )
Total | $ | 879,611 |  |  | $ | 918,497 |  |  | $ | 255,214 |  |  | $ | 252,402 |
The estimated amounts that will be amortized from AOCI into net periodic benefit cost in 2016 are as follows:
| United States |  | Foreign
Net actuarial loss | $ | 26,824 |  |  | $ | 5,804 |
Prior service credit | (60 | ) |  | (66 | )
Transition asset | — |  |  | (9 | )
Total | $ | 26,764 |  |  | $ | 5,729 |
The components of net periodic benefit cost (income) for defined benefit pension plans were as follows:
| United States |  | Foreign
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Service cost | $ | 134 |  |  | $ | 6,908 |  |  | $ | 13,981 |  |  | $ | 2,229 |  |  | $ | 3,565 |  |  | $ | 6,272 |
Interest cost | 74,331 |  |  | 77,655 |  |  | 74,370 |  |  | 24,261 |  |  | 28,518 |  |  | 27,365 |
Expected return on plan assets | (104,004 | ) |  | (103,822 | ) |  | (107,608 | ) |  | (35,421 | ) |  | (39,137 | ) |  | (34,769 | )
Amortization of net transition asset | — |  |  | — |  |  | — |  |  | (9 | ) |  | (10 | ) |  | (9 | )
Amortization of prior service (credit) cost | (60 | ) |  | 9 |  |  | 380 |  |  | (66 | ) |  | (57 | ) |  | 112 |
Amortization of net actuarial loss | 29,272 |  |  | 25,369 |  |  | 32,494 |  |  | 5,926 |  |  | 8,268 |  |  | 14,445 |
Special termination benefits | — |  |  | — |  |  | 548 |  |  | 79 |  |  | 1,238 |  |  | 935 |
Settlement / curtailment | 1,243 |  |  | 4,528 |  |  | 2,638 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | 916 |  |  | $ | 10,647 |  |  | $ | 16,803 |  |  | $ | (3,001 | ) |  | $ | 2,385 |  |  | $ | 14,351 |
Other changes in plan assets and benefit obligations for defined benefit pension plans recognized in other comprehensive income were as follows:
| United States |  | Foreign
| 2015 |  | 2014 |  | 2015 |  | 2014
Net actuarial (gain) loss | $ | (8,003 | ) |  | $ | 214,593 |  |  | $ | 8,663 |  |  | $ | 61,525 |
Prior service credit | (428 | ) |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | (29,272 | ) |  | (25,369 | ) |  | (5,926 | ) |  | (8,268 | )
Amortization of prior service credit (cost) | 60 |  |  | (9 | ) |  | 66 |  |  | 57 |
Net transition asset | — |  |  | — |  |  | 9 |  |  | 10 |
Settlement / curtailment | (1,243 | ) |  | (4,528 | ) |  | — |  |  | — |
Total recognized in other comprehensive income | $ | (38,886 | ) |  | $ | 184,687 |  |  | $ | 2,812 |  |  | $ | 53,324 |
Weighted-average actuarial assumptions used to determine end of year benefit obligations and net periodic benefit cost for defined benefit pension plans include:
| 2015 |  | 2014 |  | 2013
United States |  |  |  |  |  |  |  |  |  |  |
Used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.55% |  | 4.15% |  | 4.95%
Rate of compensation increase | N/A |  | N/A |  | 3.50%
Used to determine net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.15% |  | 4.95% |  | 4.05%
Expected return on plan assets | 7.00% |  | 7.00% |  | 7.25%
Rate of compensation increase | N/A |  | 3.50% |  | 3.50%
Foreign |  |  |  |  |  |  |  |  |  |  |
Used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |
Discount rate | 1.15 | % | - | 3.95% |  | 1.10 | % | - | 3.80% |  | 1.45 | % | - | 4.60%
Rate of compensation increase | 1.50 | % | - | 3.50% |  | 1.50 | % | - | 3.50% |  | 1.50 | % | - | 3.50%
Used to determine net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |
Discount rate | 1.10 | % | - | 3.80% |  | 1.45 | % | - | 4.60% |  | 1.95 | % | - | 4.65%
Expected return on plan assets | 4.00 | % | - | 7.00% |  | 3.75 | % | - | 7.50% |  | 3.50 | % | - | 7.50%
Rate of compensation increase | 1.50 | % | - | 3.50% |  | 1.50 | % | - | 3.50% |  | 1.50 | % | - | 3.50%
A discount rate is used to determine the present value of our future benefit obligations. The discount rate for our U.S. pension and postretirement medical benefit plans is determined by matching the expected cash flows associated with our benefit obligations to a pool of corporate long-term, high-quality fixed income debt instruments available as of the measurement date. The discount rate for our largest foreign plan, the U.K. Qualified Pension Plan (the U.K. Plan), is determined by using a model that discounts each year's estimated benefit payments by an applicable spot rate derived from a yield curve created from a large number of high quality corporate bonds. For our other smaller foreign pension plans, the discount rate is selected based on high-quality fixed income indices available in the country in which the plan is domiciled. The expected return on plan assets is based on historical and expected rates of return for current and planned asset classes in the plans' investment portfolio after analyzing historical experience and future expectations of the returns and volatility of the various asset classes. The overall expected rate of return for the portfolio is based on the target asset allocation of our global pension plans, adjusted for historical and expected experience of active portfolio management results, when compared to the benchmark returns. During 2016, we anticipate making total contributions of $9 million to our U.S. pension plans and $46 million to our foreign pension plans. We will reassess our funding alternatives as the year progresses. Investment Strategy and Asset Allocation - U.S. Pension Plans The investment strategy of our U.S. pension plans is to maximize returns within reasonable and prudent levels of risk, to achieve and maintain full funding of the accumulated benefit obligation and the actuarial liabilities and to earn a nominal rate of return of at least 7.0%. The fund has established a strategic asset allocation policy to achieve these objectives. Investments are diversified across asset classes and within each class to reduce the risk of large losses and are periodically rebalanced. Derivatives, such as swaps, options, forwards and futures contracts may be used for market exposure, to alter risk/return characteristics and to manage foreign currency exposure. Investments within the private equity and real estate portfolios are comprised of limited partnership units in primary and secondary fund of funds and units in open-ended commingled real estate funds, respectively. These types of investment vehicles are used in an effort to gain greater asset diversification. We do not have any significant concentrations of credit risk within the plan assets. The pension plans' liabilities, investment objectives and investment managers are reviewed periodically. The target asset allocation for 2016 and the actual asset allocations at December 31, 2015 and 2014, for the U.S. pension plans are as follows:
| Target allocation |  | Percent of Plan Assets at December 31,
| 2016 |  | 2015 |  | 2014
Asset category |  |  |  |  |
U.S. equities | 15 | % |  | 12 | % |  | 12 | %
Non-U.S. equities | 15 | % |  | 10 | % |  | 9 | %
Fixed income | 60 | % |  | 68 | % |  | 69 | %
Real estate | 5 | % |  | 6 | % |  | 5 | %
Private equity | 5 | % |  | 4 | % |  | 5 | %
Total | 100 | % |  | 100 | % |  | 100 | %
Investment Strategy and Asset Allocation - Foreign Pension Plans Our foreign pension plan assets are managed by outside investment managers and monitored regularly by local trustees and our corporate personnel. Investment strategies vary by country and plan, with each strategy tailored to achieve the expected rate of return within an acceptable or appropriate level of risk, depending upon the liability profile of plan participants, local funding requirements, investment markets and restrictions. The U.K. plan represents 75% of the non-U.S. pension assets. The U.K. pension plan's investment strategy is to maximize returns within reasonable and prudent levels of risk, to achieve and maintain full funding of the accumulated benefit obligation and the actuarial liabilities and to earn a nominal rate of return of at least 6.5%. The fund has established a strategic asset allocation policy to achieve these objectives. Investments are diversified across asset classes and within each class to minimize the risk of large losses and are periodically rebalanced. Derivatives, such as swaps, options, forwards and futures contracts may be used for market exposure, to alter risk/return characteristics and to manage currency exposure. We do not have any significant concentrations of credit risk within the plan assets. The pension plans' liabilities, investment objectives and investment managers are reviewed periodically. The target asset allocation for 2016 and the actual asset allocations at December 31, 2015 and 2014, for the U.K. pension plan are as follows:
| Target Allocation |  | Percent of Plan Assets at December 31,
| 2016 |  | 2015 |  | 2014
Asset category |  |  |  |  |
U.K. equities | 20 | % |  | 23 | % |  | 28 | %
Non-U.K. equities | 20 | % |  | 20 | % |  | 29 | %
Fixed income | 40 | % |  | 40 | % |  | 40 | %
Real estate | 10 | % |  | 10 | % |  | — | %
Diversified growth | 10 | % |  | 5 | % |  | — | %
Cash | — | % |  | 2 | % |  | 3 | %
Total | 100 | % |  | 100 | % |  | 100 | %
The target asset allocation used to manage the investment portfolios is based on the broad asset categories shown above. The plan asset categories presented in the fair value hierarchy are subsets of the broad asset categories. The fair value of the U.K. plan assets was $399 million and $427 million at December 31, 2015 and 2014, respectively, and the expected long-term weighted average rate of return on these plan assets was 7.00% in 2015 and 7.50% in 2014. Fair Value Measurements of Plan Assets The following tables show, by level within the fair value hierarchy, the financial assets and liabilities that are accounted for at fair value on a recurring basis at December 31, 2015 and 2014, respectively, for the U.S. and foreign pension plans. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect placement within the fair value hierarchy levels. There are no shares of our common stock included in the plan assets of our pension plans. United States Pension Plans
| December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds | $ | — |  |  | $ | 7,493 |  |  | $ | — |  |  | $ | 7,493 |
Equity securities | 174,664 |  |  | 140,270 |  |  | — |  |  | 314,934 |
Commingled fixed income securities | — |  |  | 205,246 |  |  | — |  |  | 205,246 |
Debt securities - U.S. and foreign governments, agencies and municipalities | 143,449 |  |  | 21,424 |  |  | — |  |  | 164,873 |
Debt securities - corporate | — |  |  | 592,111 |  |  | — |  |  | 592,111 |
Mortgage-backed securities | — |  |  | 14,810 |  |  | 1,592 |  |  | 16,402 |
Asset-backed securities | — |  |  | 2,535 |  |  | — |  |  | 2,535 |
Private equity | — |  |  | — |  |  | 63,577 |  |  | 63,577 |
Real estate | — |  |  | — |  |  | 82,569 |  |  | 82,569 |
Securities lending collateral (1) | — |  |  | 154,690 |  |  | — |  |  | 154,690 |
Total plan assets at fair value | $ | 318,113 |  |  | $ | 1,138,579 |  |  | $ | 147,738 |  |  | $ | 1,604,430 |
Securities lending payable (1) |  |  |  |  |  |  | (154,690 | )
Cash |  |  |  |  |  |  | 4,072 |
Other |  |  |  |  |  |  | 6,978 |
Fair value of plan assets available for benefits |  |  |  |  |  |  |  |  | $ | 1,460,790 |
| December 31, 2014
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds | $ | — |  |  | $ | 10,758 |  |  | $ | — |  |  | $ | 10,758 |
Equity securities | 180,069 |  |  | 146,716 |  |  | — |  |  | 326,785 |
Commingled fixed income securities | — |  |  | 261,571 |  |  | — |  |  | 261,571 |
Debt securities - U.S. and foreign governments, agencies and municipalities | 184,209 |  |  | 25,131 |  |  | — |  |  | 209,340 |
Debt securities - corporate | — |  |  | 598,927 |  |  | — |  |  | 598,927 |
Mortgage-backed securities | — |  |  | 20,401 |  |  | 2,102 |  |  | 22,503 |
Asset-backed securities | — |  |  | 2,158 |  |  | — |  |  | 2,158 |
Private equity | — |  |  | — |  |  | 81,246 |  |  | 81,246 |
Real estate | — |  |  | — |  |  | 74,747 |  |  | 74,747 |
Securities lending collateral (1) | — |  |  | 131,901 |  |  | — |  |  | 131,901 |
Total plan assets at fair value | $ | 364,278 |  |  | $ | 1,197,563 |  |  | $ | 158,095 |  |  | $ | 1,719,936 |
Securities lending payable (1) |  |  |  |  |  |  | (131,901 | )
Cash |  |  |  |  |  |  | 4,621 |
Other |  |  |  |  |  |  | 807 |
Fair value of plan assets available for benefits |  |  |  |  |  |  |  |  | $ | 1,593,463 |
(1) Securities lending collateral is offset by a corresponding securities lending payable amount. Foreign Plans
| December 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds | $ | — |  |  | $ | 7,596 |  |  | $ | — |  |  | $ | 7,596 |
Equity securities | 33,855 |  |  | 183,110 |  |  | — |  |  | 216,965 |
Commingled fixed income securities | — |  |  | 138,220 |  |  | — |  |  | 138,220 |
Debt securities - U.S. and foreign governments, agencies and municipalities | — |  |  | 73,573 |  |  | — |  |  | 73,573 |
Debt securities - corporate | — |  |  | 27,279 |  |  | — |  |  | 27,279 |
Real estate | — |  |  | — |  |  | 39,177 |  |  | 39,177 |
Diversified growth funds | — |  |  | — |  |  | 20,513 |  |  | 20,513 |
Total plan assets at fair value | $ | 33,855 |  |  | $ | 429,778 |  |  | $ | 59,690 |  |  | $ | 523,323 |
Cash |  |  |  |  |  |  | 6,376 |
Other |  |  |  |  |  |  | 413 |
Fair value of plan assets available for benefits |  |  |  |  |  |  |  |  | $ | 530,112 |
| December 31, 2014
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds | $ | — |  |  | $ | 6,684 |  |  | $ | — |  |  | $ | 6,684 |
Equity securities | 99,570 |  |  | 190,924 |  |  | — |  |  | 290,494 |
Commingled fixed income securities | — |  |  | 151,017 |  |  | — |  |  | 151,017 |
Debt securities - U.S. and foreign governments, agencies and municipalities | — |  |  | 85,711 |  |  | — |  |  | 85,711 |
Debt securities - corporate | — |  |  | 26,154 |  |  | — |  |  | 26,154 |
Total plan assets at fair value | $ | 99,570 |  |  | $ | 460,490 |  |  | $ | — |  |  | $ | 560,060 |
Cash |  |  |  |  |  |  | 10,859 |
Other |  |  |  |  |  |  | 4,073 |
Fair value of plan assets available for benefits |  |  |  |  |  |  |  |  | $ | 574,992 |
The following information relates to our classification of investments into the fair value hierarchy:
• | Money Market Funds: Money market funds typically invest in government securities, certificates of deposit, commercial paper of companies and other highly liquid, low risk securities. Money market funds are principally used for overnight deposits. They are classified as Level 2 since they are not actively traded on an exchange.
• | Equity Securities: Equity securities include U.S. and foreign common stock, American Depository Receipts, preferred stock and commingled funds. Equity securities classified as Level 1 are valued using active, high volume trades for identical securities. Equity securities classified as Level 2 represent those not listed on an exchange in an active market. These securities are valued based on quoted market prices of similar securities.
• | Commingled Fixed Income Securities: Mutual funds that invest in a variety of fixed income securities including securities of the U.S. government and its agencies, corporate debt, mortgage-backed securities and asset-backed securities. Value of the funds is based on the net asset value (NAV) per unit as reported by the fund manager. NAV is based on the market value of the underlying investments owned by each fund, minus its liabilities, divided by the number of shares outstanding. Commingled fixed income securities are not listed on an active exchange and are classified as Level 2.
• | Debt Securities - U.S. and Foreign Governments, Agencies and Municipalities: Government securities include treasury notes and bonds, foreign government issues, U.S. government sponsored agency debt and commingled funds. Municipal debt securities include general obligation securities and revenue-backed securities. Debt securities classified as Level 1 are valued using active, high volume trades for identical securities. Debt securities classified as Level 2 are valued through benchmarking model derived prices to quoted market prices and trade data for identical or comparable securities.
• | Debt Securities – Corporate: Investments are comprised of both investment grade debt (≥BBB-) and high-yield debt (≤BBB-). The fair value of corporate debt securities is valued using recently executed transactions, market price quotations where observable, or bond spreads. The spread data used are for the same maturity as the security. These securities are classified as Level 2.
• | Mortgage-Backed Securities (MBS): Investments are comprised of agency-backed MBS, non-agency MBS, collateralized mortgage obligations, commercial MBS, and commingled funds. These securities are valued based on external pricing indices. When external index pricing is not observable, MBS are valued based on external price/spread data. If neither pricing method is available, broker quotes are utilized. When inputs are observable and supported by an active market, MBS are classified as Level 2 and when inputs are unobservable, MBS are classified as Level 3.
• | Asset-Backed Securities (ABS): Investments are primarily comprised of credit card receivables, auto loan receivables, student loan receivables, and Small Business Administration loans. These securities are valued based on external pricing indices or external price/spread data and are classified as Level 2.
• | Private Equity: Investments are comprised of units in fund-of-funds investment vehicles. Fund-of-funds consist of various private equity investments and are used in an effort to gain greater diversification. The investments are valued in accordance with the most appropriate valuation techniques, and are classified as Level 3 due to the unobservable inputs used to determine a fair value.
• | Real Estate: Investments include units in open-ended commingled real estate funds. Properties that comprise these funds are valued in accordance with the most appropriate valuation techniques, and are classified as Level 3 due to the unobservable inputs used to determine a fair value.
• | Diversified Growth Funds: Investments are comprised of units in commingled diversified growth funds. These investments are valued based on the net asset value (NAV) per unit as reported by the fund manager, and are classified as Level 3 due to the unobservable inputs used to determine a fair value.
• | Securities Lending Fund: Investment represents a commingled fund through our custodian's securities lending program. The U.S. pension plan lends securities that are held within the plan to other banks and/or brokers, and receives collateral, typically cash. This collateral is invested in a short-term fixed income securities commingled fund. The commingled fund is not listed or traded on an exchange and is classified as Level 2. This amount invested in the fund is offset by a corresponding liability reflected in the U.S. pension plan's net assets available for benefits.
Level 3 Gains and Losses The following table summarizes the changes in the fair value of Level 3 assets for the years ended December 31, 2015 and 2014: United States Pension Plans
| Mortgage-backed securities |  | Private equity |  | Real estate |  | Total
Balance at December 31, 2013 | $ | 2,634 |  |  | $ | 87,470 |  |  | $ | 67,917 |  |  | $ | 158,021 |
Realized gains | 12 |  |  | 11,174 |  |  | 285 |  |  | 11,471 |
Unrealized gains | 59 |  |  | 1,886 |  |  | 6,140 |  |  | 8,085 |
Net purchases, sales and settlements | (603 | ) |  | (19,284 | ) |  | 405 |  |  | (19,482 | )
Balance at December 31, 2014 | 2,102 |  |  | 81,246 |  |  | 74,747 |  |  | 158,095 |
Realized gains | 10 |  |  | 14,288 |  |  | 1,027 |  |  | 15,325 |
Unrealized gains (losses) | 28 |  |  | (6,844 | ) |  | 7,043 |  |  | 227 |
Net purchases, sales and settlements | (548 | ) |  | (25,113 | ) |  | (248 | ) |  | (25,909 | )
Balance at December 31, 2015 | $ | 1,592 |  |  | $ | 63,577 |  |  | $ | 82,569 |  |  | $ | 147,738 |
Foreign Pension Plans
| Diversified growth funds |  | Real estate |  | Total
Balance at December 31, 2014 | $ | — |  |  | $ | — |  |  | $ | — |
Unrealized gains | (119 | ) |  | (1,685 | ) |  | (1,804 | )
Net purchases, sales and settlements | 20,632 |  |  | 40,862 |  |  | 61,494 |
Balance at December 31, 2015 | 20,513 |  |  | 39,177 |  |  | 59,690 |
Nonpension Postretirement Benefits The benefit obligation and funded status for nonpension postretirement benefit plans are as follows:
| 2015 |  | 2014
Benefit obligation |  |  |
Benefit obligation - beginning of year | $ | 253,980 |  |  | $ | 231,153 |
Service cost | 2,455 |  |  | 2,683 |
Interest cost | 8,799 |  |  | 9,951 |
Plan participants' contributions | 4,332 |  |  | 5,418 |
Actuarial (gain) loss | (31,253 | ) |  | 37,532 |
Foreign currency changes | (3,289 | ) |  | (2,096 | )
Curtailment | — |  |  | (2,160 | )
Benefits paid | (23,146 | ) |  | (28,501 | )
Benefit obligation - end of year (1) | $ | 211,878 |  |  | $ | 253,980 |
Fair value of plan assets |  |  |
Fair value of plan assets - beginning of year | $ | — |  |  | $ | — |
Company contribution | 18,814 |  |  | 23,083 |
Plan participants' contributions | 4,332 |  |  | 5,418 |
Benefits paid | (23,146 | ) |  | (28,501 | )
Fair value of plan assets - end of year | $ | — |  |  | $ | — |
Amounts recognized in the Consolidated Balance Sheets |  |  |
Current liability | $ | (19,406 | ) |  | $ | (22,113 | )
Non-current liability | (192,472 | ) |  | (231,867 | )
Funded status | $ | (211,878 | ) |  | $ | (253,980 | )
(1) | The benefit obligation for the U.S. nonpension postretirement plans was $198 million and $231 million at December 31, 2015 and 2014, respectively.
Pretax amounts recognized in AOCI consist of:
| 2015 |  | 2014
Net actuarial loss | $ | 59,174 |  |  | $ | 97,955 |
Prior service cost | 2,060 |  |  | 2,356 |
Total | $ | 61,234 |  |  | $ | 100,311 |
The components of net periodic benefit cost for nonpension postretirement benefit plans were as follows:
| 2015 |  | 2014 |  | 2013
Service cost | $ | 2,455 |  |  | $ | 2,683 |  |  | $ | 3,684 |
Interest cost | 8,799 |  |  | 9,951 |  |  | 9,503 |
Amortization of prior service cost | 297 |  |  | 159 |  |  | 128 |
Amortization of net actuarial loss | 7,528 |  |  | 5,949 |  |  | 7,433 |
Curtailment | — |  |  | — |  |  | 2,920 |
Net periodic benefit cost | $ | 19,079 |  |  | $ | 18,742 |  |  | $ | 23,668 |
Other changes in plan assets and benefit obligation for nonpension postretirement benefit plans recognized in other comprehensive income were as follows:
| 2015 |  | 2014
Net actuarial (gain) loss | $ | (31,253 | ) |  | $ | 37,532 |
Curtailment | — |  |  | (2,160 | )
Amortization of net actuarial loss | (7,528 | ) |  | (5,949 | )
Amortization of prior service cost | (297 | ) |  | (159 | )
Other adjustments |  |  | 412 |
Total recognized in other comprehensive income | $ | (39,078 | ) |  | $ | 29,676 |
The estimated amounts that will be amortized from AOCI into net periodic benefit cost in 2016 are as follows:
Net actuarial loss | $ | 5,438 |
Prior service cost | 297 |
Total | $ | 5,735 |
The weighted-average discount rates used to determine end of year benefit obligation and net periodic pension cost include:
| 2015 |  | 2014 |  | 2013
Discount rate used to determine benefit obligation |  |  |  |  |
U.S. | 4.20 | % |  | 3.90 | % |  | 4.40 | %
Canada | 3.95 | % |  | 3.80 | % |  | 4.65 | %
Discount rate used to determine net period benefit cost |  |  |  |  |
U.S. | 3.90 | % |  | 4.40 | % |  | 3.65 | %
Canada | 3.80 | % |  | 4.65 | % |  | 3.90 | %
The assumed health care cost trend rate used in measuring the accumulated postretirement benefit obligation for the U.S. plan was 6.0% for 2015 and 6.5% for 2014. The assumed health care trend rate is 6.0% for 2016 and will gradually decline to 5.0% by the year 2019 and remain at that level thereafter. Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A 1% change in the assumed health care cost trend rates would have the following effects:
| 1% Increase |  | 1% Decrease
Effect on total of service and interest cost components | $ | 389 |  |  | $ | (326 | )
Effect on postretirement benefit obligation | $ | 7,841 |  |  | $ | (6,730 | )
Estimated Future Benefit Payments The following benefit payments, which reflect expected future service, are expected to be paid.
| Pension Benefits |  | Nonpension Benefits
Years ending December 31, |  |  |
2016 | $ | 125,403 |  |  | $ | 19,475 |
2017 | 123,478 |  |  | 18,799 |
2018 | 124,090 |  |  | 18,088 |
2019 | 125,622 |  |  | 17,515 |
2020 | 127,960 |  |  | 16,846 |
2021 - 2025 | 644,862 |  |  | 75,468 |
| $ | 1,271,415 |  |  | $ | 166,191 |
Savings Plans We offer voluntary defined contribution plans to our U.S. employees designed to help them accumulate additional savings for retirement. We provide a core contribution to all employees, regardless if they participate in the plan, and match a portion of each participating employees' contribution, based on eligible pay. Total contributions to our defined contribution plans were $28 million in 2015 and $25 million in 2014.

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