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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | Note 11—Employee benefit plans: Defined contribution plans. Certain of our subsidiaries maintain various defined contribution pension plans for our employees worldwide. Defined contribution plan expense approximated $5.3 million in 2015, $5.6 million in 2016 and $5.5 million in 2017. Defined benefit plans. Kronos and NL sponsor various defined benefit pension plans worldwide. The benefits under our defined benefit plans are based upon years of service and employee compensation. Our funding policy is to contribute annually the minimum amount required under ERISA (or equivalent foreign) regulations plus additional amounts as we deem appropriate. We expect to contribute the equivalent of $18.9 million to all of our defined benefit pension plans during 2018. Benefit payments to plan participants out of plan assets are expected to be the equivalent of:
2018 |  | $ | 25.9 million |
2019 |  |  | 26.5 million |
2020 |  |  | 27.7 million |
2021 |  |  | 27.8 million |
2022 |  |  | 29.0 million |
Next 5 years |  |  | 157.3 million |
The funded status of our U.S. defined benefit pension plans is presented in the table below.
|  | Years ended December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Change in projected benefit obligations (“PBO”): |  |  |  |  |  |  |  |
Balance at beginning of the year |  | $ | 66.6 |  |  | $ | 62.8 |
Interest cost |  |  | 2.7 |  |  |  | 2.5 |
Actuarial losses (gains) |  |  | (2.3 | ) |  |  | 1.9 |
Benefits paid |  |  | (4.2 | ) |  |  | (4.2 | )
Balance at end of the year |  | $ | 62.8 |  |  | $ | 63.0 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value at beginning of the year |  | $ | 47.6 |  |  | $ | 45.6 |
Actual return on plan assets |  |  | 2.1 |  |  |  | 4.0 |
Employer contributions |  |  | .1 |  |  |  | 1.1 |
Benefits paid |  |  | (4.2 | ) |  |  | (4.2 | )
Fair value at end of year |  | $ | 45.6 |  |  | $ | 46.5 |
Funded status |  | $ | (17.2 | ) |  | $ | (16.5 | )
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |  |  |  |  |
Accrued pension costs: |  |  |  |  |  |  |  |
Current |  | $ | (.2 | ) |  | $ | (.3 | )
Noncurrent |  |  | (17.0 | ) |  |  | (16.2 | )
Total |  |  | (17.2 | ) |  |  | (16.5 | )
Accumulated other comprehensive loss— |  |  |  |  |  |  |  |
Actuarial loss |  |  | 39.3 |  |  |  | 37.2 |
Total |  | $ | 22.1 |  |  | $ | 20.7 |
Accumulated benefit obligations (“ABO”) |  | $ | 62.8 |  |  | $ | 63.0 |
The components of our net periodic defined benefit pension benefit cost for U.S. plans are presented in the table below. The amounts shown below for the amortization of unrecognized actuarial losses for 2015, 2016 and 2017 were recognized as components of our accumulated other comprehensive income (loss) at December 31, 2014, 2015 and 2016, respectively, net of deferred income taxes and noncontrolling interest.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Net periodic pension benefit cost (credit) for U.S. plans: |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 2.7 |  |  | $ | 2.7 |  |  | $ | 2.5 |
Expected return on plan assets |  |  | (3.9 | ) |  |  | (3.4 | ) |  |  | (3.3 | )
Amortization of unrecognized net actuarial loss |  |  | 1.7 |  |  |  | 1.9 |  |  |  | 2.0 |
Total |  | $ | .5 |  |  | $ | 1.2 |  |  | $ | 1.2 |
Information concerning certain of our U.S. defined benefit pension plans (for which the ABO exceeds the fair value of plan assets as of the indicated date) is presented in the table below. .
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Plans for which the ABO exceeds plan assets: |  |  |  |  |  |  |  |
Projected benefit obligations |  | $ | 62.8 |  |  | $ | 63.0 |
Accumulated benefit obligations |  |  | 62.8 |  |  |  | 63.0 |
Fair value of plan assets |  |  | 45.6 |  |  |  | 46.5 |
The discount rate assumptions used in determining the actuarial present value of the benefit obligation for our U.S. defined benefit pension plans as of December 31, 2016 and 2017 are 3.9% and 3.5%, respectively. The impact of assumed increases in future compensation levels does not have an effect on the benefit obligation as the plans are frozen with regards to compensation. The weighted-average rate assumptions used in determining the net periodic pension cost for our U.S. defined benefit pension plans for 2015, 2016 and 2017 are presented in the table below. The impact of assumed increases in future compensation levels does not have an effect on the periodic pension cost as the plans are frozen with regards to compensation.
|  | Years ended December 31, |
Rate |  | 2015 |  |  | 2016 |  |  | 2017 |
Discount rate |  |  | 3.8 | % |  |  | 4.1 | % |  |  | 3.9 | %
Long-term return on plan assets |  |  | 7.5 | % |  |  | 7.5 | % |  |  | 7.5 | %
Variances from actuarially assumed rates will result in increases or decreases in accumulated pension obligations, pension expense and funding requirements in future periods. The funded status of our foreign defined benefit pension plans is presented in the table below.
|  | Years ended December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Change in PBO: |  |  |  |  |  |  |  |
Balance at beginning of the year |  | $ | 578.9 |  |  | $ | 603.4 |
Service cost |  |  | 9.9 |  |  |  | 11.4 |
Interest cost |  |  | 15.1 |  |  |  | 13.4 |
Participants’ contributions |  |  | 1.5 |  |  |  | 1.5 |
Actuarial loss |  |  | 35.6 |  |  |  | 9.3 |
Plan settlement |  |  | — |  |  |  | (.3 | )
Change in currency exchange rates |  |  | (16.8 | ) |  |  | 73.7 |
Benefits paid |  |  | (20.8 | ) |  |  | (21.2 | )
Balance at end of the year |  | $ | 603.4 |  |  | $ | 691.2 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value at beginning of the year |  | $ | 382.5 |  |  | $ | 381.8 |
Actual return on plan assets |  |  | 12.2 |  |  |  | 24.1 |
Employer contributions |  |  | 15.3 |  |  |  | 16.0 |
Participants’ contributions |  |  | 1.5 |  |  |  | 1.5 |
Change in currency exchange rates |  |  | (8.9 | ) |  |  | 43.0 |
Benefits paid |  |  | (20.8 | ) |  |  | (21.2 | )
Fair value at end of year |  | $ | 381.8 |  |  | $ | 445.2 |
Funded status |  | $ | (221.6 | ) |  | $ | (246.0 | )
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |  |  |  |  |
Pension asset |  | $ | 1.6 |  |  | $ | 4.2 |
Accrued pension costs: |  |  |  |  |  |  |  |
Noncurrent |  |  | (223.2 | ) |  |  | (250.2 | )
Total |  |  | (221.6 | ) |  |  | (246.0 | )
Accumulated other comprehensive loss: |  |  |  |  |  |  |  |
Actuarial loss |  |  | 261.2 |  |  |  | 242.8 |
Prior service cost |  |  | 1.7 |  |  |  | 1.5 |
Total |  |  | 262.9 |  |  |  | 244.3 |
Total |  | $ | 41.3 |  |  | $ | (1.7 | )
ABO |  | $ | 578.8 |  |  | $ | 664.7 |
The components of our net periodic defined benefit pension benefit cost for our foreign plans are presented in the table below. The amounts shown below for the amortization of unrecognized prior service cost and actuarial losses for 2015, 2016 and 2017 were recognized as components of our accumulated other comprehensive income (loss) at December 31, 2014, 2015 and 2016, respectively, net of deferred income taxes and noncontrolling interest.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Net periodic pension cost for foreign plans: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 11.2 |  |  | $ | 9.9 |  |  | $ | 11.4 |
Interest cost |  |  | 15.1 |  |  |  | 15.1 |  |  |  | 13.4 |
Settlement loss |  |  | — |  |  |  | — |  |  |  | .1 |
Expected return on plan assets |  |  | (17.3 | ) |  |  | (14.9 | ) |  |  | (9.7 | )
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | .4 |  |  |  | .2 |  |  |  | .3 |
Net actuarial loss |  |  | 13.8 |  |  |  | 11.4 |  |  |  | 13.2 |
Total |  | $ | 23.2 |  |  | $ | 21.7 |  |  | $ | 28.7 |
Information concerning certain of our non-U.S. defined benefit pension plans (for which the ABO exceeds the fair value of plan assets as of the indicated date) is presented in the table below.
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Plans for which the ABO exceeds plan assets: |  |  |  |  |  |  |  |
Projected benefit obligations |  | $ | 541.5 |  |  | $ | 625.1 |
Accumulated benefit obligations |  |  | 521.8 |  |  |  | 603.8 |
Fair value of plan assets |  |  | 319.5 |  |  |  | 375.0 |
A summary of our key actuarial assumptions used to determine foreign benefit obligations as of December 31, 2016 and 2017 was:
|  | December 31, |
Rate |  | 2016 |  |  | 2017 |
Discount rate |  |  | 2.1 | % |  |  | 2.1 | %
Increase in future compensation levels |  |  | 2.6 | % |  |  | 2.6 | %
A summary of our key actuarial assumptions used to determine foreign net periodic benefit cost for 2015, 2016 and 2017 are as follows:
|  | Years ended December 31, |
Rate |  | 2015 |  |  | 2016 |  |  | 2017 |
Discount rate |  |  | 2.5 | % |  |  | 2.6 | % |  |  | 2.1 | %
Increase in future compensation levels |  |  | 2.6 | % |  |  | 2.9 | % |  |  | 2.6 | %
Long-term return on plan assets |  |  | 4.6 | % |  |  | 3.9 | % |  |  | 2.5 | %
Variances from actuarially assumed rates will result in increases or decreases in accumulated pension obligations, pension expense and funding requirements in future periods. The amounts shown for all of our defined benefit plans for unrecognized actuarial losses and prior service cost at December 31, 2016 and 2017 have not been recognized as components of our periodic defined benefit pension cost as of those dates. These amounts will be recognized as components of our periodic defined benefit cost in future years. These amounts, net of deferred income taxes and noncontrolling interest, are recognized in our accumulated other comprehensive income (loss) at December 31, 2016 and 2017. We expect approximately $15.0 million and $.2 million of the unrecognized actuarial losses and prior service cost, respectively, will be recognized as components of our periodic defined benefit pension cost in 2018. The table below details the changes in other comprehensive income (loss) during 2015, 2016 and 2017.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) |  | $ | .3 |  |  | $ | (38.0 | ) |  | $ | 4.0 |
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | .4 |  |  |  | .3 |  |  |  | .3 |
Net actuarial losses |  |  | 15.4 |  |  |  | 13.3 |  |  |  | 15.2 |
Total |  | $ | 16.1 |  |  | $ | (24.4 | ) |  | $ | 19.5 |
At December 31, 2016 and 2017, substantially all of the assets attributable to our U.S. plan were invested in the Combined Master Retirement Trust (CMRT), a collective investment trust sponsored by Contran to permit the collective investment by certain master trusts that fund certain employee benefits plans sponsored by Contran and certain of its affiliates. For 2015, 2016 and 2017, the long-term rate of return assumption for plan assets invested in the CMRT was 7.5%, based on the long-term asset mix of the assets of the CMRT and the expected long-term rates of return for such asset components as well as advice from Contran’s actuaries. The CMRT unit value is determined semi-monthly, and the plans have the ability to redeem all or any portion of their investment in the CMRT at any time based on the most recent semi-monthly valuation. However, the plans do not have the right to individual assets held by the CMRT and the CMRT has the sole discretion in determining how to meet any redemption request. For purposes of our plan asset disclosure, we consider the investment in the CMRT as a Level 2 input because (i) the CMRT value is established semi-monthly and the plans have the right to redeem their investment in the CMRT, in part or in whole, at any time based on the most recent value and (ii) observable inputs from Level 1 or Level 2 (or assets not subject to classification in the fair value hierarchy) were used to value approximately 92% and 93% of the assets of the CMRT at December 31, 2016 and 2017, respectively, as noted below. CMRT assets not subject to classification in the fair value hierarchy consist principally of certain investments measured at net asset value per share in accordance with ASC 820-10. The aggregate fair value of all of the CMRT assets, including funds of Contran and its other affiliates that also invest in the CMRT, and supplemental asset mix details of the CMRT are as follows:
| December 31,
| 2016 |  | 2017
| (In millions)
CMRT asset value | $ | 637.8 |  |  | $ | 672.4 |
CMRT assets comprised of: |  |  |  |  |  |  |
Assets not subject to fair value hierarchy |  | 30 | % |  |  | 31 | %
Assets subject to fair value hierarchy: |  |  |  |  |  |  |
Level 1 |  | 54 |  |  |  | 54 |
Level 2 |  | 8 |  |  |  | 8 |
Level 3 |  | 8 |  |  |  | 7 |
|  | 100 | % |  |  | 100 | %
CMRT asset mix: |  |  |  |  |  |  |
Domestic equities, principally publicly traded |  | 31 | % |  |  | 33 | %
International equities, principally publicly traded |  | 22 |  |  |  | 25 |
Fixed income securities, principally publicly traded |  | 36 |  |  |  | 31 |
Privately managed limited partnerships |  | 5 |  |  |  | 4 |
Hedge funds |  | 5 |  |  |  | 5 |
Other, primarily cash |  | 1 |  |  |  | 2 |
|  | 100 | % |  |  | 100 | %
In determining the expected long-term rate of return on non-U.S. plan asset assumptions, we consider the long-term asset mix (e.g. equity vs. fixed income) for the assets for each of our plans and the expected long-term rates of return for such asset components. In addition, we receive third-party advice about appropriate long-term rates of return. Such assumed asset mixes are summarized below:
| • | In Germany, the composition of our plan assets is established to satisfy the requirements of the German insurance commissioner. Our German pension plan assets represent an investment in a large collective investment fund established and maintained by Bayer AG in which several pension plans, including our German pension plan and Bayer’s pension plans, have invested. Our plan assets represent a very nominal portion of the total collective investment fund maintained by Bayer. These plan assets are a Level 3 input because there is not an active market that approximates the value of our investment in the Bayer investment fund. We determine the fair value of the Bayer plan assets based on periodic reports we receive from the managers of the Bayer plan. These periodic reports are subject to audit by the German pension regulator.
| • | In Canada, we currently have a plan asset target allocation of 20% to 30% to equity securities and 70% to 80% to fixed income securities. We expect the long-term rate of return for such investments to average approximately 125 basis points above the applicable equity or fixed income index. The Canadian assets are Level 1 inputs because they are traded in active markets.
| • | In Norway, we currently have a plan asset target allocation of 11% to equity securities, 79% to fixed income securities, 7% to real estate and the remainder primarily to other investments and liquid investments such as money markets. The expected long-term rate of return for such investments is approximately 6%, 3%, 5% and 7%, respectively. The majority of Norwegian plan assets are Level 1 inputs because they are traded in active markets; however approximately 10% of our Norwegian plan assets are invested in real estate and other investments not actively traded and are therefore a Level 3 input.
| • | We also have plan assets in Belgium and the United Kingdom. The Belgian plan assets are invested in certain individualized fixed income insurance contracts for the benefit of each plan participant as required by the local regulators and are therefore a Level 3 input. The United Kingdom plan assets consist of marketable securities which are Level 1 inputs because they trade in active markets.
We regularly review our actual asset allocation for each plan, and will periodically rebalance the investments in each plan to more accurately reflect the targeted allocation and/or maximize the overall long-term return when considered appropriate. The composition of our December 31, 2016 and 2017 pension plan assets by asset category and fair value level is shown in the table below. The amounts shown for plan assets invested in the CMRT include a nominal amount of cash held by our U.S. pension plan which is not part of the plan’s investment in the CMRT.
|  | Fair Value Measurements at December 31, 2016 |
|  | Total |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
|  | (In millions) |
Germany |  | $ | 217.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 217.0 |
Canada: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Local currency equities |  |  | 14.8 |  |  |  | 14.8 |  |  |  | — |  |  |  | — |
Foreign currency equities |  |  | 19.7 |  |  |  | 19.7 |  |  |  | — |  |  |  | — |
Local currency fixed income |  |  | 59.5 |  |  |  | 59.5 |  |  |  | — |  |  |  | — |
Cash and other |  |  | .4 |  |  |  | .4 |  |  |  | — |  |  |  | — |
Norway: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Local currency equities |  |  | 1.6 |  |  |  | 1.6 |  |  |  | — |  |  |  | — |
Foreign currency equities |  |  | 4.1 |  |  |  | 4.1 |  |  |  | — |  |  |  | — |
Local currency fixed income |  |  | 23.2 |  |  |  | 23.2 |  |  |  | — |  |  |  | — |
Foreign currency fixed income |  |  | 5.4 |  |  |  | 5.4 |  |  |  | — |  |  |  | — |
Real estate |  |  | 4.2 |  |  |  | — |  |  |  | — |  |  |  | 4.2 |
Cash and other |  |  | 9.9 |  |  |  | 8.8 |  |  |  |  |  |  |  | 1.1 |
US — CMRT |  |  | 45.6 |  |  |  | — |  |  |  | 45.6 |  |  |  | — |
Other |  |  | 22.0 |  |  |  | 13.8 |  |  |  | — |  |  |  | 8.2 |
Total |  | $ | 427.4 |  |  | $ | 151.3 |  |  | $ | 45.6 |  |  | $ | 230.5 |
|  | Fair Value Measurements at December 31, 2017 |
|  | Total |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
|  | (In millions) |
Germany |  | $ | 257.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 257.9 |
Canada: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Local currency equities |  |  | 8.4 |  |  |  | 8.4 |  |  |  | — |  |  |  | — |
Foreign currency equities |  |  | 16.4 |  |  |  | 16.4 |  |  |  | — |  |  |  | — |
Local currency fixed income |  |  | 81.8 |  |  |  | 81.8 |  |  |  | — |  |  |  | — |
Cash and other |  |  | .3 |  |  |  | .3 |  |  |  | — |  |  |  | — |
Norway: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Local currency equities |  |  | 1.8 |  |  |  | 1.8 |  |  |  | — |  |  |  | — |
Foreign currency equities |  |  | 4.6 |  |  |  | 4.6 |  |  |  | — |  |  |  | — |
Local currency fixed income |  |  | 21.0 |  |  |  | 21.0 |  |  |  | — |  |  |  | — |
Foreign currency fixed income |  |  | 6.8 |  |  |  | 6.8 |  |  |  | — |  |  |  | — |
Real estate |  |  | 4.7 |  |  |  | — |  |  |  | — |  |  |  | 4.7 |
Cash and other |  |  | 15.4 |  |  |  | 14.5 |  |  |  | — |  |  |  | .9 |
US — CMRT |  |  | 46.5 |  |  |  | — |  |  |  | 46.5 |  |  |  | — |
Other |  |  | 26.1 |  |  |  | 16.0 |  |  |  | — |  |  |  | 10.1 |
Total |  | $ | 491.7 |  |  | $ | 171.6 |  |  | $ | 46.5 |  |  | $ | 273.6 |
A rollforward of the change in fair value of Level 3 assets follows.
|  | Years ended December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Fair value at beginning of year |  | $ | 236.2 |  |  | $ | 230.5 |
Gain on assets held at end of year |  |  | 4.1 |  |  |  | 11.0 |
Gain on assets sold during the year |  |  | — |  |  |  | .2 |
Assets purchased |  |  | 13.1 |  |  |  | 13.4 |
Assets sold |  |  | (13.4 | ) |  |  | (13.8 | )
Currency exchange rate fluctuations |  |  | (9.5 | ) |  |  | 32.3 |
Fair value at end of year |  | $ | 230.5 |  |  | $ | 273.6 |
Postretirement benefits other than pensions (“OPEB”). NL, Kronos and Tremont provide certain health care and life insurance benefits for their eligible Canadian and U.S. retired employees. Certain of our Canadian employees may become eligible for such postretirement health care and life insurance benefits if they reach retirement age while working for us. In the U.S., employees who retired after 1998 are not entitled to any such benefits. The majority of all retirees are required to contribute a portion of the cost of their benefits and certain current and future retirees are eligible for reduced health care benefits at age 65. We have no OPEB plan assets, rather, we fund medical claims as they are paid. At December 31, 2017, we expect to contribute the equivalent of approximately $1.0 million to all of our OPEB plans during 2018. Benefit payments to OPEB plan participants are expected to be the equivalent of:
2018 |  | $ | 1.0 million |
2019 |  |  | .9 million |
2020 |  |  | .9 million |
2021 |  |  | .8 million |
2022 |  |  | .8 million |
Next 5 years |  |  | 3.4 million |
The funded status of our OPEB plans is presented in the table below.
|  | Years ended December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Actuarial present value of accumulated OPEB obligations: |  |  |  |  |  |  |  |
Obligations at beginning of the year |  | $ | 12.9 |  |  | $ | 12.2 |
Service cost |  |  | .1 |  |  |  | .1 |
Interest cost |  |  | .5 |  |  |  | .4 |
Actuarial gain |  |  | (.5 | ) |  |  | — |
Change in currency exchange rates |  |  | .2 |  |  |  | .5 |
Benefits paid from employer contributions |  |  | (1.0 | ) |  |  | (.9 | )
Obligations at end of the year |  |  | 12.2 |  |  | $ | 12.3 |
Fair value of plan assets |  |  | — |  |  |  | — |
Funded status |  | $ | (12.2 | ) |  | $ | (12.3 | )
Accrued OPEB costs recognized in the Consolidated Balance Sheets: |  |  |  |  |  |  |  |
Current |  | $ | (1.1 | ) |  | $ | (1.0 | )
Noncurrent |  |  | (11.1 | ) |  |  | (11.3 | )
Total |  |  | (12.2 | ) |  |  | (12.3 | )
Accumulated other comprehensive (income) loss: |  |  |  |  |  |  |  |
Net actuarial losses |  |  | 1.9 |  |  |  | 2.2 |
Prior service credit |  |  | (6.8 | ) |  |  | (5.7 | )
Total |  |  | (4.9 | ) |  |  | (3.5 | )
Total |  | $ | (17.1 | ) |  | $ | (15.8 | )
The amounts shown in the table above for net actuarial losses and prior service credit at December 31, 2016 and 2017 have not yet been recognized as components of our periodic OPEB cost as of those dates. These amounts will be recognized as components of our periodic OPEB cost in future years and are recognized, net of deferred income taxes, in our accumulated other comprehensive income (loss). We expect to recognize approximately $.2 million of unrecognized actuarial gains and $1.1 million of prior service credit as components of our periodic OPEB cost in 2018. The components of our periodic OPEB costs are presented in the table below. The amounts shown below for amortization of prior service credit and recognized actuarial gains for 2015, 2016 and 2017 were recognized as components of our accumulated other comprehensive income (loss) at December 31, 2014, 2015 and 2016, respectively, net of deferred income taxes and noncontrolling interest.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Net periodic OPEB cost (credit): |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | .1 |  |  | $ | .1 |  |  | $ | .1 |
Interest cost |  |  | .5 |  |  |  | .5 |  |  |  | .4 |
Amortization of prior service credit |  |  | (1.9 | ) |  |  | (1.8 | ) |  |  | (1.1 | )
Recognized net actuarial gain |  |  | — |  |  |  | (.1 | ) |  |  | (.2 | )
Total |  | $ | (1.3 | ) |  | $ | (1.3 | ) |  | $ | (.8 | )
The table below details the changes in other comprehensive income (loss) during 2015, 2016 and 2017.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Changes in benefit obligations recognized in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial losses (gains) arising during the year |  | $ | .8 |  |  | $ | .5 |  |  | $ | (.2 | )
Plan amendments/curtailment |  |  | — |  |  |  | (.1 | ) |  |  | — |
Amortization of unrecognized prior service credit |  |  | (1.9 | ) |  |  | (1.8 | ) |  |  | (1.1 | )
Total |  | $ | (1.1 | ) |  | $ | (1.4 | ) |  | $ | (1.3 | )
A summary of our key actuarial assumptions used to determine the net benefit obligations as of December 31, 2016 and 2017 follows:
|  | December 31, |
|  | 2016 |  |  | 2017 |
Healthcare inflation: |  |  |  |  |  |  |  |
Initial rate |  |  | 7.0 | % |  |  | 6.25 – 6.5 | %
Ultimate rate |  |  | 5.0 | % |  |  | 5.0 | %
Year of ultimate rate achievement |  |  | 2021 |  |  |  | 2021 |
Discount rate |  |  | 3.4 | % |  |  | 3.1 | %
Assumed health care cost trend rates affect the amounts we report for health care plans. A one percent change in assumed health care trend rates would not have a material effect on the net periodic OPEB cost for 2017 or on the accumulated OPEB obligations at December 31, 2017. The weighted average discount rate used in determining the net periodic OPEB cost for 2017 was 3.35% (the rate was 3.6% in 2016 and 3.4% in 2015). The weighted average rate was determined using the projected benefit obligations as of the beginning of each year. The impact of assumed increases in future compensation levels does not have a material effect on the net periodic OPEB cost as substantially all of such benefits relate solely to eligible retirees, for which compensation is not applicable. The impact of the assumed rate of return on plan assets also does not have a material effect on the net periodic OPEB cost as there were no plan assets as of December 31, 2016 or 2017. Variances from actuarially-assumed rates will result in additional increases or decreases in accumulated OPEB obligations, net periodic OPEB cost and funding requirements in future periods.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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