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Benefit Plans | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Plan [Abstract] |
Schedule of Defined Benefit Plans Disclosures |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 142,450 |  |  | $ | 130,202 |  |  | $ | 961,263 |  |  | $ | 864,095 |  |  | $ | 1,295 |  |  | $ | 2,186 |  |  | $ | 1,105,008 |  |  | $ | 996,483 |
Service cost, gross | 1,304 |  |  | 1,063 |  |  | 33,995 |  |  | 30,665 |  |  | — |  |  | — |  |  | 35,299 |  |  | 31,728 |
Interest cost | 3,556 |  |  | 4,585 |  |  | 4,778 |  |  | 10,192 |  |  | 25 |  |  | 64 |  |  | 8,359 |  |  | 14,841 |
Actuarial losses (gains) | 10,733 |  |  | 14,449 |  |  | 43,508 |  |  | 84,262 |  |  | (70) |  |  | (129) |  |  | 54,171 |  |  | 98,582 |
Plan amendments and other | — |  |  | — |  |  | 112 |  |  | — |  |  | — |  |  | (576) |  |  | 112 |  |  | (576) |
Benefits paid | (8,096) |  |  | (7,849) |  |  | (39,412) |  |  | (38,181) |  |  | (220) |  |  | (250) |  |  | (47,728) |  |  | (46,280) |
Impact of foreign currency | — |  |  | — |  |  | 87,567 |  |  | 10,230 |  |  | — |  |  | — |  |  | 87,567 |  |  | 10,230 |
Benefit obligation at end of year | $ | 149,947 |  |  | $ | 142,450 |  |  | $ | 1,091,811 |  |  | $ | 961,263 |  |  | $ | 1,030 |  |  | $ | 1,295 |  |  | $ | 1,242,788 |  |  | $ | 1,105,008 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 102,812 |  |  | $ | 95,541 |  |  | $ | 861,962 |  |  | $ | 767,410 |  |  | $ | — |  |  | $ | — |  |  | $ | 964,774 |  |  | $ | 862,951 |
Actual return on plan assets | 9,223 |  |  | 15,037 |  |  | 39,535 |  |  | 76,732 |  |  | — |  |  | — |  |  | 48,758 |  |  | 91,769 |
Employer contributions | 5,523 |  |  | 83 |  |  | 26,249 |  |  | 25,323 |  |  | 220 |  |  | 250 |  |  | 31,992 |  |  | 25,656 |
Plan participants’ contributions | — |  |  | — |  |  | 15,681 |  |  | 15,130 |  |  | — |  |  | — |  |  | 15,681 |  |  | 15,130 |
Benefits paid | (8,096) |  |  | (7,849) |  |  | (39,412) |  |  | (38,181) |  |  | (220) |  |  | (250) |  |  | (47,728) |  |  | (46,280) |
Impact of foreign currency and other | — |  |  | — |  |  | 80,307 |  |  | 15,548 |  |  | — |  |  | — |  |  | 80,307 |  |  | 15,548 |
Fair value of plan assets at end of year | $ | 109,462 |  |  | $ | 102,812 |  |  | $ | 984,322 |  |  | $ | 861,962 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,093,784 |  |  | $ | 964,774 |
Funded status | $ | (40,485) |  |  | $ | (39,638) |  |  | $ | (107,489) |  |  | $ | (99,301) |  |  | $ | (1,030) |  |  | $ | (1,295) |  |  | $ | (149,004) |  |  | $ | (140,234) |
Schedule of Amounts Recognized in Balance Sheet |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Other non-current assets | $ | — |  |  | $ | — |  |  | $ | 51,619 |  |  | $ | 44,536 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,619 |  |  | $ | 44,536 |
Accrued and other liabilities | (133) |  |  | (126) |  |  | (5,549) |  |  | (5,023) |  |  | (153) |  |  | (239) |  |  | (5,835) |  |  | (5,388) |
Pension and other post-retirement liabilities | (40,353) |  |  | (39,512) |  |  | (153,559) |  |  | (138,813) |  |  | (877) |  |  | (1,057) |  |  | (194,789) |  |  | (179,382) |
Accumulated other comprehensive loss (income) | 69,296 |  |  | 64,269 |  |  | 332,280 |  |  | 286,370 |  |  | (891) |  |  | (924) |  |  | 400,685 |  |  | 349,715 |
Total | $ | 28,810 |  |  | $ | 24,631 |  |  | $ | 224,791 |  |  | $ | 187,070 |  |  | $ | (1,921) |  |  | $ | (2,220) |  |  | $ | 251,680 |  |  | $ | 209,481 |
Schedule of Net Periodic Benefit Cost Not yet Recognized |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total |  | Total, After Tax
Plan amendments and prior service cost | $ | — |  |  | $ | (9,857) |  |  | $ | (501) |  |  | $ | (10,358) |  |  | $ | (8,262) |
Actuarial losses (gains) | 69,296 |  |  | 342,137 |  |  | (390) |  |  | 411,043 |  |  | 322,947 |
Total | $ | 69,296 |  |  | $ | 332,280 |  |  | $ | (891) |  |  | $ | 400,685 |  |  | $ | 314,685 |
Schedule of Changes in Accumulated Postemployment Benefit Obligations |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total |  | Total, After Tax
Net actuarial losses (gains) | $ | 7,605 |  |  | $ | 37,041 |  |  | $ | (70) |  |  | $ | 44,576 |  |  | $ | 35,662 |
Plan amendment | — |  |  | 112 |  |  | — |  |  | 112 |  |  | 93 |
Amortization of: |  |  |  |  |  |  |  |  |
Actuarial (losses) gains | (2,578) |  |  | (23,251) |  |  | 28 |  |  | (25,801) |  |  | (20,370) |
Plan amendments and prior service cost | — |  |  | 7,117 |  |  | 75 |  |  | 7,192 |  |  | 5,823 |
Impact of foreign currency | — |  |  | 24,891 |  |  | — |  |  | 24,891 |  |  | 19,701 |
Total | $ | 5,027 |  |  | $ | 45,910 |  |  | $ | 33 |  |  | $ | 50,970 |  |  | $ | 40,909 |
Schedule of Assumptions Used in Computing Benefit Obligation |
| U.S. |  | Non-U.S.
| 2020 |  | 2019 |  | 2020 |  | 2019
Discount rate | 2.22 | % |  | 3.03 | % |  | 0.32 | % |  | 0.51 | %
Compensation increase rate | n/a |  | n/a |  | 0.86 | % |  | 0.86 | %
Expected long-term rate of return on plan assets | 5.75 | % |  | 6.25 | % |  | 3.73 | % |  | 3.76 | %
Interest crediting risk | n/a |  | n/a |  | 0.50 | % |  | 0.80 | %
Schedule of Assumptions Used in Computing Pension Cost |
| U.S. |  | Non-U.S.
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Discount rate | 3.03 | % |  | 4.11 | % |  | 3.49 | % |  | 0.51 | % |  | 1.22 | % |  | 0.97 | %
Compensation increase rate | n/a |  | n/a |  | n/a |  | 0.86 | % |  | 0.87 | % |  | 0.87 | %
Expected long-term rate of return on plan assets | 6.25 | % |  | 6.50 | % |  | 6.50 | % |  | 3.76 | % |  | 3.84 | % |  | 3.86 | %
Schedule of Net Benefit Costs [Table Text Block] | Net periodic pension cost and net periodic post-retirement benefit for the defined benefit plans and U.S. post-retirement plan include the following components for the years ended December 31:
| U.S. |  | Non-U.S. |  | Other Benefits |  | Total
2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Service cost, net | $ | 1,304 |  |  | $ | 1,063 |  |  | $ | 1,090 |  |  | $ | 18,314 |  |  | $ | 15,534 |  |  | $ | 15,545 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 19,618 |  |  | $ | 16,597 |  |  | $ | 16,635 |
Interest cost on projected benefit obligations | 3,556 |  |  | 4,585 |  |  | 4,242 |  |  | 4,778 |  |  | 10,192 |  |  | 8,630 |  |  | 25 |  |  | 64 |  |  | 66 |  |  | 8,359 |  |  | 14,841 |  |  | 12,938 |
Expected return on plan assets | (6,094) |  |  | (5,887) |  |  | (6,929) |  |  | (33,067) |  |  | (29,162) |  |  | (31,005) |  |  | — |  |  | — |  |  | — |  |  | (39,161) |  |  | (35,049) |  |  | (37,934) |
Recognition of actuarial losses/(gains) and prior service costs | 2,578 |  |  | 2,374 |  |  | 5,804 |  |  | 16,134 |  |  | 13,784 |  |  | 14,575 |  |  | (103) |  |  | (691) |  |  | (1,623) |  |  | 18,609 |  |  | 15,467 |  |  | 18,756 |
Net periodic pension cost / (benefit) | $ | 1,344 |  |  | $ | 2,135 |  |  | $ | 4,207 |  |  | $ | 6,159 |  |  | $ | 10,348 |  |  | $ | 7,745 |  |  | $ | (78) |  |  | $ | (627) |  |  | $ | (1,557) |  |  | $ | 7,425 |  |  | $ | 11,856 |  |  | $ | 10,395 |
Schedule of Allocation of Plan Assets |
| December 31, 2020 |  | December 31, 2019
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Observable Inputs for Identical Assets (Level 2) |  | Unobservable Inputs (Level 3) |  | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Observable Inputs for Identical Assets (Level 2) |  | Unobservable Inputs (Level 3) |  | Total
Asset Category: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents | $ | 166,614 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,614 |  |  | $ | 104,144 |  |  | $ | — |  |  | $ | — |  |  | $ | 104,144 |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mettler-Toledo Stock | 3,767 |  |  | — |  |  | — |  |  | 3,767 |  |  | 2,620 |  |  | — |  |  | — |  |  | 2,620 |
Equity Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S.(1) | 7,467 |  |  | 30,460 |  |  | — |  |  | 37,927 |  |  | 7,245 |  |  | 29,885 |  |  | — |  |  | 37,130 |
International(2) | 83,309 |  |  | 41,027 |  |  | — |  |  | 124,336 |  |  | 62,569 |  |  | 53,188 |  |  | — |  |  | 115,757 |
Emerging Markets(3) | 131,103 |  |  | 966 |  |  | — |  |  | 132,069 |  |  | 110,972 |  |  | 822 |  |  | — |  |  | 111,794 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate/Government Bonds(4) | 92,085 |  |  | — |  |  | — |  |  | 92,085 |  |  | 84,020 |  |  | — |  |  | — |  |  | 84,020 |
Fixed Income Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Contracts(5) | — |  |  | 43,055 |  |  | 1,793 |  |  | 44,848 |  |  | — |  |  | 37,459 |  |  | 1,486 |  |  | 38,945 |
Core Bond(6) | 72,061 |  |  | 64,111 |  |  | — |  |  | 136,172 |  |  | 116,629 |  |  | 61,960 |  |  | — |  |  | 178,589 |
Real Asset Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate(7) | 117,089 |  |  | 15,864 |  |  | — |  |  | 132,953 |  |  | 95,580 |  |  | 14,185 |  |  | — |  |  | 109,765 |
Commodities(8) | 53,088 |  |  | — |  |  | — |  |  | 53,088 |  |  | 47,697 |  |  | — |  |  | — |  |  | 47,697 |
Other Types of Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities (9) | 43,060 |  |  | — |  |  | — |  |  | 43,060 |  |  | 39,275 |  |  | — |  |  | — |  |  | 39,275 |
Global Allocation Funds(10) | 12,359 |  |  | — |  |  | — |  |  | 12,359 |  |  | 12,269 |  |  | — |  |  | — |  |  | 12,269 |
Insurance Linked Securities(11) | 19,038 |  | — |  |  | — |  |  | 19,038 |  |  | 18,434 |  |  | — |  |  | — |  |  | 18,434 |
Total assets in fair value hierarchy | $ | 801,040 |  |  | $ | 195,483 |  |  | $ | 1,793 |  |  | $ | 998,316 |  |  | $ | 701,454 |  |  | $ | 197,499 |  |  | $ | 1,486 |  |  | $ | 900,439 |
Investments measured at net asset value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International(12) |  |  |  |  |  |  | 2,930 |  |  |  |  |  |  |  | 3,288 |
Emerging Markets (12) |  |  |  |  |  |  | 7,262 |  |  |  |  |  |  |  | 6,650
Multi-Strategy Fund of Hedge Funds (12) |  |  |  |  |  |  | 85,276 |  |  |  |  |  |  |  | 54,397
Total pension assets at fair value |  |  |  |  |  |  | $ | 1,093,784 |  |  |  |  |  |  |  |  | $ | 964,774 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |
| Insurance Contracts
Balance at December 31, 2018 | $ | 1,461 |
Actual return on plan assets related to assets held at end of year | 14 |
Sales | (54) |
Purchases | 83 |
Impact of foreign currency | (18) |
Balance at December 31, 2019 | $ | 1,486 |
Actual return on plan assets related to assets held at end of year | 22 |
Purchases | 99 |
Impact of foreign currency | 186 |
Balance at December 31, 2020 | $ | 1,793 |
Schedule of Expected Benefit Payments |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits Net of Subsidy |  | Total
2021 | $ | 8,382 |  |  | $ | 49,784 |  |  | $ | 153 |  |  | $ | 58,319 |
2022 | 8,507 |  |  | 48,687 |  |  | 128 |  |  | 57,322 |
2023 | 8,666 |  |  | 49,242 |  |  | 110 |  |  | 58,018 |
2024 | 8,750 |  |  | 50,370 |  |  | 98 |  |  | 59,218 |
2025 | 8,778 |  |  | 50,415 |  |  | 87 |  |  | 59,280 |
2026-2030 | 42,808 |  |  | 246,920 |  |  | 303 |  |  | 290,031 |

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