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Benefit Plans and Other Postretirement Benefits | 12 Months Ended
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Dec. 31, 2019
Benefit Plans and Other Postretirement Benefits |
Benefit Plans and Other Postretirement Benefits | Note 9—Benefit Plans and Other Postretirement Benefits ​ Defined Benefit Plans ​ The Company and certain of its domestic subsidiaries have defined benefit pension plans (the “U.S. Plans”), which cover certain U.S. employees and which represent the majority of the plan assets and benefit obligations of the aggregate defined benefit plans of the Company. The U.S. Plans’ benefits are generally based on years of service and compensation and are generally noncontributory. Certain U.S. employees not covered by the U.S. Plans are covered by defined contribution plans. Certain foreign subsidiaries have defined benefit plans covering their employees (the “Foreign Plans” and together with the U.S. Plans, the “Plans”). The largest foreign pension plan, in accordance with local regulations, is unfunded and had a projected benefit obligation of approximately $103.6 and $92.7 at December 31, 2019 and 2018, respectively. Total required contributions to be made during 2020 for the unfunded Foreign Plans are included in Other accrued expenses in the accompanying Consolidated Balance Sheets and in the tables below. ​ The following is a summary of the Company’s defined benefit plans’ funded status as of the most recent actuarial valuations as of December 31 of each year. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | U.S. Plans | ​ | Foreign Plans | ​ | Total
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2019 | ​ | ​ | 2018
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 448.9 | ​ | $ | 486.7 | ​ | $ | 235.3 | ​ | $ | 255.0 | ​ | $ | 684.2 | ​ | $ | 741.7
Service cost | ​ |  | 5.4 | ​ |  | 4.5 | ​ |  | 2.6 | ​ |  | 2.8 | ​ |  | 8.0 | ​ |  | 7.3
Interest cost | ​ |  | 16.8 | ​ |  | 14.9 | ​ |  | 4.7 | ​ |  | 4.7 | ​ |  | 21.5 | ​ |  | 19.6
Plan amendments | ​ |  | 4.8 | ​ |  | 0.2 | ​ |  | — | ​ |  | 0.8 | ​ |  | 4.8 | ​ |  | 1.0
Actuarial (gain) loss | ​ |  | 47.1 | ​ |  | (33.1) | ​ |  | 24.8 | ​ |  | (3.1) | ​ |  | 71.9 | ​ |  | (36.2)
Foreign exchange translation | ​ |  | — | ​ |  | — | ​ |  | 1.6 | ​ |  | (13.0) | ​ |  | 1.6 | ​ |  | (13.0)
Benefits paid | ​ |  | (26.5) | ​ |  | (24.3) | ​ |  | (7.6) | ​ |  | (11.9) | ​ |  | (34.1) | ​ |  | (36.2)
Projected benefit obligation at end of year | ​ |  | 496.5 | ​ |  | 448.9 | ​ |  | 261.4 | ​ |  | 235.3 | ​ |  | 757.9 | ​ |  | 684.2
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ |  | 418.2 | ​ |  | 389.6 | ​ |  | 95.9 | ​ |  | 108.3 | ​ |  | 514.1 | ​ |  | 497.9
Actual return on plan assets | ​ |  | 80.5 | ​ |  | (28.8) | ​ |  | 11.4 | ​ |  | (0.9) | ​ |  | 91.9 | ​ |  | (29.7)
Employer contributions | ​ |  | 1.0 | ​ |  | 81.7 | ​ |  | 5.6 | ​ |  | 6.6 | ​ |  | 6.6 | ​ |  | 88.3
Foreign exchange translation | ​ |  | — | ​ |  | — | ​ |  | 2.5 | ​ |  | (6.2) | ​ |  | 2.5 | ​ |  | (6.2)
Benefits paid | ​ |  | (26.5) | ​ |  | (24.3) | ​ |  | (7.6) | ​ |  | (11.9) | ​ |  | (34.1) | ​ |  | (36.2)
Fair value of plan assets at end of year | ​ |  | 473.2 | ​ |  | 418.2 | ​ |  | 107.8 | ​ |  | 95.9 | ​ |  | 581.0 | ​ |  | 514.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Underfunded status at end of year | ​ | $ | 23.3 | ​ | $ | 30.7 | ​ | $ | 153.6 | ​ | $ | 139.4 | ​ | $ | 176.9 | ​ | $ | 170.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts recognized on the balance sheet as of December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other accrued expenses | ​ | $ | 1.0 | ​ | $ | 1.0 | ​ | $ | 3.2 | ​ | $ | 2.9 | ​ | $ | 4.2 | ​ | $ | 3.9
Accrued pension and postretirement benefit obligations | ​ | ​ | 22.3 | ​ | ​ | 29.7 | ​ | ​ | 150.4 | ​ | ​ | 136.5 | ​ | ​ | 172.7 | ​ | ​ | 166.2
Underfunded status at end of year | ​ | $ | 23.3 | ​ | $ | 30.7 | ​ | $ | 153.6 | ​ | $ | 139.4 | ​ | $ | 176.9 | ​ | $ | 170.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive loss, net | ​ | $ | (131.5) | ​ | $ | (140.2) | ​ | $ | (62.0) | ​ | $ | (52.7) | ​ | $ | (193.5) | ​ | $ | (192.9)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average assumptions used to determine projected benefit obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate |  | ​ | 3.11 | % | ​ | 4.14 | % | ​ | 1.59 | % | ​ | 2.28 | % | ​ | ​ | ​ | ​ | ​
Rate of compensation increase |  | ​ | 2.60 | % | ​ | 3.00 | % | ​ | 1.78 | % | ​ | 1.77 | % | ​ | ​ | ​ | ​ | ​
​ The projected benefit obligation increased in 2019 primarily due to higher actuarial losses in 2019, primarily resulting from the impact of lower discount rates on our projected benefit obligation. The projected benefit obligation decreased in 2018 primarily due to actuarial gains in 2018 resulting from the impact of higher discount rates on our projected benefit obligation. The accumulated benefit obligation for the Company’s defined benefit pension plans was $748.4 and $674.5 at December 31, 2019 and 2018, respectively. As of December 31, 2019 and 2018, the accumulated benefit obligation for the U.S. Plans was $495.0 and $446.4, respectively, and for the Foreign Plans was $253.4 and $228.1, respectively. All of the Company’s U.S. Plans and Foreign Plans have accumulated benefit obligations (and projected benefit obligations) in excess of plan assets as of December 31, 2019 and 2018. ​ The amounts, before tax, included in Accumulated other comprehensive loss at December 31, 2019 and 2018 that have not yet been recognized as expense were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | U.S. Plans | ​ | Foreign Plans | ​ | Total
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2019 | ​ | ​ | 2018
Actuarial losses, net | ​ | $ | 164.3 | ​ | $ | 178.8 | ​ | $ | 76.9 | ​ | $ | 63.4 | ​ | $ | 241.2 | ​ | $ | 242.2
Prior service cost | ​ | ​ | 8.7 | ​ | ​ | 5.7 | ​ | ​ | 0.8 | ​ | ​ | 0.8 | ​ | ​ | 9.5 | ​ | ​ | 6.5
​ The following is a summary of the components of net pension expense for the Company’s defined benefit plans for the years ended December 31, 2019, 2018 and 2017: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. Plans | ​ | Foreign Plans | ​ | Total
​ |  | 2019 |  | 2018 |  | 2017 | ​ | 2019 |  | 2018 |  | 2017 | ​ | 2019 |  | 2018 |  | 2017
Components of net pension expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 5.4 | ​ | $ | 4.5 | ​ | $ | 6.7 | ​ | $ | 2.6 | ​ | $ | 2.8 | ​ | $ | 2.9 | ​ | $ | 8.0 | ​ | $ | 7.3 | ​ | $ | 9.6
Interest cost | ​ |  | 16.8 | ​ |  | 14.9 | ​ |  | 15.3 | ​ |  | 4.7 | ​ |  | 4.7 | ​ |  | 4.7 | ​ |  | 21.5 | ​ |  | 19.6 | ​ |  | 20.0
Expected return on plan assets | ​ |  | (33.2) | ​ |  | (34.5) | ​ |  | (27.2) | ​ |  | (3.7) | ​ |  | (3.8) | ​ |  | (3.5) | ​ |  | (36.9) | ​ |  | (38.3) | ​ |  | (30.7)
Amortization of prior service cost | ​ | ​ | 1.7 | ​ | ​ | 2.3 | ​ | ​ | 2.7 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.8 | ​ | ​ | 2.3 | ​ | ​ | 2.7
Settlements | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.6 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.6 | ​ | ​ | —
Amortization of actuarial losses | ​ |  | 14.4 | ​ |  | 19.0 | ​ |  | 18.3 | ​ |  | 4.1 | ​ |  | 4.2 | ​ |  | 4.6 | ​ |  | 18.5 | ​ |  | 23.2 | ​ |  | 22.9
Net pension expense | ​ | $ | 5.1 | ​ | $ | 6.2 | ​ | $ | 15.8 | ​ | $ | 7.8 | ​ | $ | 8.5 | ​ | $ | 8.7 | ​ | $ | 12.9 | ​ | $ | 14.7 | ​ | $ | 24.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average assumptions used to determine net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate |  | ​ | 4.14 | % | ​ | 3.48 | % | ​ | 3.93 | % | ​ | 2.28 | % | ​ | 2.21 | % | ​ | 2.28 | % | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected long-term return on assets |  | ​ | 7.50 | % | ​ | 7.75 | % | ​ | 7.75 | % | ​ | 3.75 | % | ​ | 3.69 | % | ​ | 3.80 | % | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Rate of compensation increase |  | ​ | 3.00 | % | ​ | 3.00 | % | ​ | 3.00 | % | ​ | 1.77 | % | ​ | 1.70 | % | ​ | 1.63 | % | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​ The pension expense for the Plans is calculated based upon a number of actuarial assumptions established on January 1 of the applicable year, including mortality projections as well as a weighted average discount rate, rate of increase in future compensation levels and an expected long-term rate of return on the respective Plans’ assets which are detailed in the table above. The Company records service costs in the same line item as the respective employee compensation costs and within operating income, while all other pension-related costs including interest cost, expected return on plan assets, amortization of prior service cost and amortization of net actuarial losses are reported separately within Other income, net in the Consolidated Statements of Income. ​ The discount rate used by the Company for valuing pension liabilities is based on a review of high quality corporate bond yields with maturities approximating the remaining life of the projected benefit obligations. The weighted average discount rate for the U.S. Plans on this basis was 3.11% and 4.14% at December 31, 2019 and 2018, respectively. The decrease in the discount rate for the U.S. Plans resulted in an increase in the benefit obligation of approximately $50 at December 31, 2019. The weighted average discount rate for the Foreign Plans was 1.59% and 2.28% at December 31, 2019 and 2018, respectively. The increase in the benefit obligation associated with our Foreign Plans at December 31, 2019 was primarily driven by the decrease in the discount rate. The Company calculates its service and interest costs by applying a split discount rate approach under which specific spot rates along the selected yield curve are applied to the relevant projected cash flows as the Company believes this method more precisely measures its obligations. The mortality assumptions used by the Company reflect commonly used mortality tables and improvement scales for each plan and increased life expectancies for plan participants. ​ The primary investment objective of the Plans is to build and ensure an adequate pool of assets to support the benefit obligations to participants, retirees and beneficiaries. To meet this objective, the Plans seek to earn a rate of return on assets greater than the liability discount rate, with a prudent level of risk and diversification. The current investment policy includes a strategy to maintain an adequate level of diversification, subject to portfolio risks. The target allocations for the U.S. Plans are generally 60% equity and 40% fixed income. Short-term strategic ranges for investments are established within these long term target percentages. The Company invests in a diversified investment portfolio through various investment managers and evaluates its plan assets for the existence of concentration risks. As of December 31, 2019, there were no significant concentrations of risks in the Company’s defined benefit plan assets. The Company does not invest nor instruct investment managers to invest pension assets in Amphenol securities. The Plans may indirectly hold the Company’s securities as a result of external investment management in certain commingled funds. Such holdings would not be material relative to the Plans’ total assets. The Company’s Foreign Plans primarily invest in equity and debt securities and insurance contracts, as determined by each Plans’ Trustees or investment managers. ​ In developing the expected long-term rate of return assumption for the U.S. Plans, the Company evaluated input from its external actuaries and investment consultants as well as consideration of long-term inflation assumptions. Projected returns by such consultants are based on broad equity and bond indices. The Company also considered its historical compounded return of approximately 8.6%, which has been in excess of these broad equity and bond benchmark indices. As described above, the expected long-term rate of return on the U.S. Plans’ assets is based on an asset allocation assumption of approximately 60% with equity managers (with an expected long-term rate of return of approximately 8%) and 40% with fixed income managers (with an expected long-term rate of return of approximately 6%). The Company believes that the long-term asset allocation on average will approximate 60% with equity managers and 40% with fixed income managers. The Company regularly reviews the actual asset allocation and periodically rebalances investments to its targeted allocation when considered appropriate. ​ The Company’s Plan assets, the vast majority of which relate to the U.S. Plans, are reported at fair value and classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The process requires judgment and may have an effect on the placement of the Plan assets within the fair value measurement hierarchy. The fair values of the Company’s pension Plans’ assets at December 31, 2019 and 2018 by asset category are as follows (refer to Note 5 for definitions of Level 1, 2 and 3 inputs): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Assets Measured at
Asset Category | ​ | Total | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Net Asset Value (a)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. equities — large cap | ​ | $ | 112.0 | ​ | $ | 56.9 | ​ | $ | 55.1 | ​ | $ | — | ​ | $ | —
U.S. equities — small/mid cap and other | ​ |  | 36.4 | ​ |  | — | ​ |  | 36.4 | ​ |  | — | ​ |  | —
International equities — growth | ​ |  | 56.9 | ​ |  | 51.8 | ​ |  | 5.1 | ​ |  | — | ​ |  | —
International equities — other | ​ |  | 74.9 | ​ |  | — | ​ |  | 41.0 | ​ |  | — | ​ |  | 33.9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Alternative investment funds | ​ | ​ | 21.1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 21.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed income securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. fixed income securities — short term | ​ |  | 18.1 | ​ |  | — | ​ |  | 18.1 | ​ |  | — | ​ |  | —
U.S. fixed income securities — intermediate term | ​ |  | 26.8 | ​ |  | 26.8 | ​ |  | — | ​ |  | — | ​ |  | —
U.S. fixed income securities — long term | ​ | ​ | 118.6 | ​ |  | — | ​ |  | 118.6 | ​ |  | — | ​ |  | —
U.S. fixed income securities — high yield | ​ |  | 14.2 | ​ |  | — | ​ |  | 14.2 | ​ |  | — | ​ |  | —
International fixed income securities — other | ​ |  | 24.0 | ​ | ​ | — | ​ |  | 24.0 | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Insurance contracts | ​ |  | 37.0 | ​ |  | — | ​ |  | — | ​ |  | 37.0 | ​ |  | —
Real estate funds | ​ |  | 10.7 | ​ |  | — | ​ |  | — | ​ |  | 10.7 | ​ |  | —
Cash and cash equivalents (b) | ​ |  | 30.3 | ​ |  | 30.3 | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 581.0 | ​ | $ | 165.8 | ​ | $ | 312.5 | ​ | $ | 47.7 | ​ | $ | 55.0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. equities — large cap | ​ | $ | 139.3 | ​ | $ | 104.9 | ​ | $ | 34.4 | ​ | $ | — | ​ | $ | —
U.S. equities — small/mid cap and other | ​ |  | 27.5 | ​ |  | — | ​ |  | 27.5 | ​ |  | — | ​ |  | —
International equities — growth | ​ |  | 32.7 | ​ |  | 28.0 | ​ |  | 4.7 | ​ |  | — | ​ |  | —
International equities — other | ​ |  | 84.9 | ​ |  | — | ​ |  | 34.0 | ​ |  | — | ​ |  | 50.9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Alternative investment funds | ​ | ​ | 19.9 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 19.9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed income securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. fixed income securities — short term | ​ |  | 11.2 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 11.2
U.S. fixed income securities — intermediate term | ​ |  | 77.7 | ​ |  | 77.7 | ​ |  | — | ​ |  | — | ​ |  | —
U.S. fixed income securities — high yield | ​ |  | 26.4 | ​ |  | — | ​ |  | 26.4 | ​ |  | — | ​ |  | —
International fixed income securities — other | ​ |  | 45.9 | ​ | ​ | — | ​ |  | 45.9 | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Insurance contracts | ​ | ​ | 35.1 | ​ |  | — | ​ |  | — | ​ |  | 35.1 | ​ |  | —
Real estate funds | ​ |  | 10.2 | ​ |  | — | ​ |  | — | ​ |  | 10.2 | ​ |  | —
Cash and cash equivalents | ​ | ​ | 3.3 | ​ |  | 3.3 | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 514.1 | ​ | $ | 213.9 | ​ | $ | 172.9 | ​ | $ | 45.3 | ​ | $ | 82.0
(a) | Certain investments measured at fair value using the net asset value (NAV) practical expedient have been removed from the fair value hierarchy but included in the table above in order to permit the reconciliation of the fair value hierarchy to total plan assets.
(b) | The majority of the cash and cash equivalents on hand at December 31, 2019, which is primarily within the U.S. Plans, was subsequently invested, in early January 2020, in certain equity securities within the International equities-other category.
​ Equity securities consist primarily of publicly traded U.S. and non-U.S. equities. Publicly traded securities are valued at the last trade or closing price reported in the active market in which the individual securities are traded. Certain equity securities held in commingled funds are valued at unitized net asset value (“NAV”) based on the fair value of the underlying net assets owned by the funds. Alternative investment funds include investments in hedge funds including fund of fund products. ​ Fixed income securities consist primarily of government securities and corporate bonds. They are valued at the closing price in the active market or at quotes obtained from brokers/dealers or pricing services. Certain fixed income securities held within commingled funds are valued based on the fair value of the underlying net assets of the funds, as determined by the custodian of the funds. ​ The Level 2 pension plan assets are primarily comprised of pooled funds valued using published prices based off of observable market data. ​ The Level 3 pension plan assets as of December 31, 2019 and 2018 included in the table above consist primarily of contracts with insurance companies related to certain foreign plans. The insurance contracts generally include guarantees in accordance with the policy purchased. Our valuation of Level 3 assets is based on insurance company or third-party actuarial valuations, representing an estimation of the surrender or market values of the insurance contract between the Company and the insurance companies. Our Level 3 pension plan assets also include certain investments in commingled real estate funds which are valued based on unobservable market price inputs. The following table sets forth a summary of changes of the fair value of the Level 3 pension plan assets for the years ended December 31, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | 2019 | ​ | ​ | 2018
Balance on January 1 | ​ | $ | 45.3 | ​ | $ | 44.9
Unrealized gains (losses), net | ​ | ​ | 4.0 | ​ | ​ | 1.2
Purchases, sales and settlements, net | ​ | ​ | (1.2) | ​ | ​ | 0.9
Foreign currency translation | ​ | ​ | (0.4) | ​ | ​ | (1.7)
Balance on December 31 | ​ | $ | 47.7 | ​ | $ | 45.3
​ The Company made cash contributions to the Plans of $6.6, $88.3, and $22.5 in 2019, 2018, and 2017, respectively. In January 2018, the Company made voluntary cash contributions of approximately $81.0 to fund the U.S. Plans. There is no current requirement for cash contributions to any of the U.S. Plans, and the Company plans to evaluate annually, based on actuarial calculations and the investment performance of the Plans’ assets, the timing and amount of cash contributions in the future. ​ Benefit payments related to the Plans above, including those amounts to be paid out of Company assets and reflecting future expected service as appropriate, are expected to be as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | U.S. | ​ | Foreign | ​ | ​ |
Year | ​ | Plans | ​ | Plans | ​ | Total |
2020 |  | $ | 26.7 |  | $ | 6.9 |  | $ | 33.6 |
2021 | ​ |  | 27.9 | ​ |  | 7.3 | ​ |  | 35.2 | ​
2022 | ​ |  | 28.9 | ​ |  | 8.6 | ​ |  | 37.5 | ​
2023 | ​ |  | 29.8 | ​ |  | 8.4 | ​ |  | 38.2 | ​
2024 | ​ |  | 30.5 | ​ |  | 9.6 | ​ |  | 40.1 | ​
2025-2029 | ​ |  | 152.7 | ​ |  | 53.1 | ​ |  | 205.8 | ​
​ The Company also has an unfunded Supplemental Employee Retirement Plan (“SERP”), which provides for the payment of the portion of annual pension which cannot be paid from the retirement plan as a result of regulatory limitations on average compensation for purposes of the benefit computation. The obligation related to the SERP is included in the accompanying Consolidated Balance Sheets and in the tables above. ​ Certain foreign subsidiaries of the Company offer certain benefits under local statutory plans which are excluded from the tables above. The net liability for such plans was $15.1 and $13.7 as of December 31, 2019 and 2018, respectively, the majority of which is included within Accrued pension and postretirement benefit obligations in the accompanying Consolidated Balance Sheets. ​ Other Postretirement Benefit Plans ​ The Company maintains self-insurance programs for that portion of its health care and workers compensation costs not covered by insurance. The Company also provides certain health care and life insurance benefits to certain eligible retirees in the U.S. through postretirement benefit (“OPEB”) programs. The Company’s share of the cost of such plans for most participants is fixed, and any increase in the cost of such plans will be the responsibility of the retirees. The Company funds the benefit costs for such plans on a pay-as-you-go basis. As of December 31, 2019 and 2018, the total liability associated with postretirement benefit obligations was approximately $7.9 and $8.4, respectively, the majority of which is included in Accrued pension and postretirement benefit obligations on the accompanying Consolidated Balance Sheets. The weighted average discount rate used to determine the projected benefit obligation as of December 31, 2019 and 2018 was 3.10% and 4.06%, respectively. Net postretirement benefit expense on the accompanying Consolidated Statements of Income for the years ended December 31, 2019, 2018 and 2017 were $0.3, $0.8 and $0.9, respectively. Since the Company’s obligation for postretirement medical plans is fixed and since the benefit obligation and the net postretirement benefit expense are not material in relation to the Company’s financial condition or results of operations, the Company believes any change in medical costs from that estimated will not have a significant impact on the Company. ​ Defined Contribution Plans ​ The Company offers various defined contribution plans for certain U.S. and foreign employees. Participation in these plans is based on certain eligibility requirements. Through 2018, the Company matched the majority of employee contributions to the U.S. defined contribution plans with cash contributions up to a maximum of 5% of eligible compensation. Effective January 1, 2019, the Company increased its matching of employee contributions to the U.S. defined contribution plans to a maximum of 6% of eligible compensation. The Company provided matching contributions to the U.S. defined contribution plans of approximately $13.1, $8.6 and $6.9 in 2019, 2018 and 2017, respectively.

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