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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan [Abstract] |
Schedule of Defined Benefit Plans Disclosures |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 138,155 |  |  | $ | 154,415 |  |  | $ | 838,277 |  |  | $ | 818,269 |  |  | $ | 2,985 |  |  | $ | 3,272 |  |  | $ | 979,417 |  |  | $ | 975,956 |
Service cost, gross | 565 |  |  | 432 |  |  | 29,600 |  |  | 29,936 |  |  | — |  |  | — |  |  | 30,165 |  |  | 30,368 |
Interest cost | 4,374 |  |  | 4,428 |  |  | 8,511 |  |  | 10,664 |  |  | 70 |  |  | 76 |  |  | 12,955 |  |  | 15,168 |
Actuarial losses (gains) | 6,979 |  |  | 845 |  |  | 33,036 |  |  | 42,786 |  |  | 18 |  |  | 318 |  |  | 40,033 |  |  | 43,949 |
Plan amendments and other | — |  |  | — |  |  | (15,153 | ) |  | — |  |  | 137 |  |  | 150 |  |  | (15,016 | ) |  | 150 |
Benefits paid | (7,502 | ) |  | (21,965 | ) |  | (30,356 | ) |  | (33,977 | ) |  | (537 | ) |  | (831 | ) |  | (38,395 | ) |  | (56,773 | )
Impact of foreign currency | — |  |  | — |  |  | 54,563 |  |  | (29,401 | ) |  | — |  |  | — |  |  | 54,563 |  |  | (29,401 | )
Benefit obligation at end of year | $ | 142,571 |  |  | $ | 138,155 |  |  | $ | 918,478 |  |  | $ | 838,277 |  |  | $ | 2,673 |  |  | $ | 2,985 |  |  | $ | 1,063,722 |  |  | $ | 979,417 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 104,103 |  |  | $ | 119,118 |  |  | $ | 716,169 |  |  | $ | 725,597 |  |  | $ | — |  |  | $ | — |  |  | $ | 820,272 |  |  | $ | 844,715 |
Actual return on plan assets | 14,869 |  |  | 6,876 |  |  | 49,055 |  |  | 15,927 |  |  | — |  |  | — |  |  | 63,924 |  |  | 22,803 |
Employer contributions | 97 |  |  | 74 |  |  | 22,961 |  |  | 22,291 |  |  | 400 |  |  | 681 |  |  | 23,458 |  |  | 23,046 |
Plan participants’ contributions | — |  |  | — |  |  | 13,503 |  |  | 13,277 |  |  | 137 |  |  | 150 |  |  | 13,640 |  |  | 13,427 |
Benefits paid | (7,502 | ) |  | (21,965 | ) |  | (30,356 | ) |  | (33,977 | ) |  | (537 | ) |  | (831 | ) |  | (38,395 | ) |  | (56,773 | )
Impact of foreign currency and other | — |  |  | — |  |  | 36,883 |  |  | (26,946 | ) |  | — |  |  | — |  |  | 36,883 |  |  | (26,946 | )
Fair value of plan assets at end of year | $ | 111,567 |  |  | $ | 104,103 |  |  | $ | 808,215 |  |  | $ | 716,169 |  |  | $ | — |  |  | $ | — |  |  | $ | 919,782 |  |  | $ | 820,272 |
Funded status | $ | (31,004 | ) |  | $ | (34,052 | ) |  | $ | (110,263 | ) |  | $ | (122,108 | ) |  | $ | (2,673 | ) |  | $ | (2,985 | ) |  | $ | (143,940 | ) |  | $ | (159,145 | )
Schedule of Amounts Recognized in Balance Sheet |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Other non-current assets | $ | — |  |  | $ | — |  |  | $ | 40,493 |  |  | $ | 10,530 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,493 |  |  | $ | 10,530 |
Accrued and other liabilities | (88 | ) |  | (92 | ) |  | (4,990 | ) |  | (4,293 | ) |  | (411 | ) |  | (467 | ) |  | (5,489 | ) |  | (4,852 | )
Pension and other post-retirement liabilities | (30,916 | ) |  | (33,960 | ) |  | (145,766 | ) |  | (128,345 | ) |  | (2,262 | ) |  | (2,518 | ) |  | (178,944 | ) |  | (164,823 | )
Accumulated other comprehensive loss (income) | 61,819 |  |  | 69,528 |  |  | 254,870 |  |  | 255,855 |  |  | (2,365 | ) |  | (5,057 | ) |  | 314,324 |  |  | 320,326 |
Total | $ | 30,815 |  |  | $ | 35,476 |  |  | $ | 144,607 |  |  | $ | 133,747 |  |  | $ | (5,038 | ) |  | $ | (8,042 | ) |  | $ | 170,384 |  |  | $ | 161,181 |
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 | $ | — |  |  | $ | (30,698 | ) |  | $ | (372 | ) |  | $ | (31,070 | ) |  | $ | (24,289 | )
Actuarial losses (gains) | 61,819 |  |  | 285,568 |  |  | (1,993 | ) |  | 345,394 |  |  | 257,274 |
Total | $ | 61,819 |  |  | $ | 254,870 |  |  | $ | (2,365 | ) |  | $ | 314,324 |  |  | $ | 232,985 |
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) | $ | (1,153 | ) |  | $ | 14,330 |  |  | $ | 18 |  |  | $ | 13,195 |  |  | $ | 10,378 |
Plan amendment | — |  |  | (15,153 | ) |  | — |  |  | (15,153 | ) |  | (12,056 | )
Amortization of: |  |  |  |  |  |  |  |  |  |
Actuarial (losses) gains | (6,556 | ) |  | (23,144 | ) |  | 1,895 |  |  | (27,805 | ) |  | (20,821 | )
Plan amendments and prior service cost | — |  |  | 6,897 |  |  | 779 |  |  | 7,676 |  |  | 5,948 |
Impact of foreign currency | — |  |  | 16,085 |  |  | — |  |  | 16,085 |  |  | 12,092 |
Total | $ | (7,709 | ) |  | $ | (985 | ) |  | $ | 2,692 |  |  | $ | (6,002 | ) |  | $ | (4,459 | )
Schedule of Assumptions Used in Computing Benefit Obligation |
| U.S. |  | Non-U.S.
| 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate | 3.49 | % |  | 3.97 | % |  | 0.97 | % |  | 0.98 | %
Compensation increase rate | n/a |  |  | n/a |  |  | 0.87 | % |  | 0.85 | %
Expected long-term rate of return on plan assets | 6.50 | % |  | 6.75 | % |  | 3.86 | % |  | 4.09 | %
Schedule of Assumptions Used in Computing Pension Cost |
| U.S. |  | Non-U.S.
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate | 3.97 | % |  | 4.27 | % |  | 4.00 | % |  | 0.98 | % |  | 1.31 | % |  | 1.65 | %
Compensation increase rate | n/a |  |  | n/a |  |  | n/a |  |  | 0.85 | % |  | 1.03 | % |  | 1.61 | %
Expected long-term rate of return on plan assets | 6.75 | % |  | 7.25 | % |  | 7.50 | % |  | 4.09 | % |  | 4.58 | % |  | 4.82 | %
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
2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost, net | $ | 565 |  |  | $ | 432 |  |  | $ | 837 |  |  | $ | 16,341 |  |  | $ | 16,804 |  |  | $ | 18,664 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 16,906 |  |  | $ | 17,236 |  |  | $ | 19,501 |
Interest cost on projected benefit obligations | 4,374 |  |  | 4,428 |  |  | 6,431 |  |  | 8,511 |  |  | 10,664 |  |  | 14,071 |  |  | 70 |  |  | 76 |  |  | 139 |  |  | 12,955 |  |  | 15,168 |  |  | 20,641 |
Expected return on plan assets | (6,737 | ) |  | (7,781 | ) |  | (9,575 | ) |  | (30,349 | ) |  | (33,168 | ) |  | (36,832 | ) |  | — |  |  | — |  |  | — |  |  | (37,086 | ) |  | (40,949 | ) |  | (46,407 | )
Recognition of actuarial losses/(gains) and prior service costs | 6,556 |  |  | 7,606 |  |  | 7,626 |  |  | 16,247 |  |  | 12,923 |  |  | 10,639 |  |  | (2,674 | ) |  | (4,567 | ) |  | (5,247 | ) |  | 20,129 |  |  | 15,962 |  |  | 13,018 |
Settlement charge | — |  |  | 7,963 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,963 |  |  | — |
Net periodic pension cost / (benefit) | $ | 4,758 |  |  | $ | 12,648 |  |  | $ | 5,319 |  |  | $ | 10,750 |  |  | $ | 7,223 |  |  | $ | 6,542 |  |  | $ | (2,604 | ) |  | $ | (4,491 | ) |  | $ | (5,108 | ) |  | $ | 12,904 |  |  | $ | 15,380 |  |  | $ | 6,753 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits |  | Total
Plan amendments and prior service costs | $ | — |  |  | $ | (6,966 | ) |  | $ | (372 | ) |  | $ | (7,338 | )
Actuarial losses (gains) | 5,804 |  |  | 21,620 |  |  | (1,250 | ) |  | 26,174 |
Total | $ | 5,804 |  |  | $ | 14,654 |  |  | $ | (1,622 | ) |  | $ | 18,836 |
Schedule of Allocation of Plan Assets |
| December 31, 2017 |  | December 31, 2016
| 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 | $ | 154,751 |  |  | $ | — |  |  | $ | — |  |  | $ | 154,751 |  |  | $ | 131,468 |  |  | $ | — |  |  | $ | — |  |  | $ | 131,468 |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mettler-Toledo Stock | 3,154 |  |  | — |  |  | — |  |  | 3,154 |  |  | 2,846 |  |  | — |  |  | — |  |  | 2,846 |
Equity Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S.(1) | 6,011 |  |  | 27,984 |  |  | — |  |  | 33,995 |  |  | 5,860 |  |  | 24,257 |  |  | — |  |  | 30,117 |
International(2) | 80,836 |  |  | 61,341 |  |  | — |  |  | 142,177 |  |  | 54,760 |  |  | 52,404 |  |  | — |  |  | 107,164 |
Emerging Markets(3) | 100,346 |  |  | 1,096 |  |  | — |  |  | 101,442 |  |  | 78,999 |  |  | 793 |  |  | — |  |  | 79,792 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate/Government Bonds(4) | 72,334 |  |  | — |  |  | — |  |  | 72,334 |  |  | 69,578 |  |  | — |  |  | — |  |  | 69,578 |
Fixed Income Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Contracts(5) | — |  |  | 23,421 |  |  | 1,514 |  |  | 24,935 |  |  | — |  |  | 19,955 |  |  | 1,300 |  |  | 21,255 |
Core Bond(6) | 136,157 |  |  | 57,499 |  |  | — |  |  | 193,656 |  |  | 121,884 |  |  | 52,955 |  |  | — |  |  | 174,839 |
Real Asset Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate(7) | 79,218 |  |  | 8,836 |  |  | — |  |  | 88,054 |  |  | 69,284 |  |  | — |  |  | — |  |  | 69,284 |
Commodities(8) | 37,302 |  |  | — |  |  | — |  |  | 37,302 |  |  | 22,964 |  |  | — |  |  | 5,594 |  |  | 28,558 |
Other Types of Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Global Allocation Funds(9) | 11,781 |  |  | 12,545 |  |  | — |  |  | 24,326 |  |  | 11,981 |  |  | 11,285 |  |  | — |  |  | 23,266 |
Insurance Linked Securities(10) | 12,147 |  |  | — |  |  | — |  |  | 12,147 |  |  | — |  |  | — |  |  | — |  |  | — |
Total assets in fair value hierarchy | $ | 694,037 |  |  | $ | 192,722 |  |  | $ | 1,514 |  |  | $ | 888,273 |  |  | $ | 569,624 |  |  | $ | 161,649 |  |  | $ | 6,894 |  |  | $ | 738,167 |
Investments measured at net asset value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Emerging Markets (3) |  |  |  |  |  |  | 5,950 |  |  |  |  |  |  |  | 4,407
Multi-Strategy Fund of Hedge Funds (11) |  |  |  |  |  |  | 25,559 |  |  |  |  |  |  |  | 77,698
Total pension assets at fair value |  |  |  |  |  |  | $ | 919,782 |  |  |  |  |  |  |  |  | $ | 820,272 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |
| Commodities |  | Insurance Contract |  | Total
Balance at December 31, 2015 | $ | 33,505 |  |  | $ | 1,367 |  |  | $ | 34,872 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Related to assets held at end of year | — |  |  | 25 |  |  | 25 |
Related to assets sold during the year | (2,857 | ) |  | — |  |  | (2,857 | )
Sales | (21,278 | ) |  | (38 | ) |  | (21,316 | )
Impact of foreign currency | (3,776 | ) |  | (54 | ) |  | (3,830 | )
Balance at December 31, 2016 | $ | 5,594 |  |  | $ | 1,300 |  |  | $ | 6,894 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Related to assets held at end of year | — |  |  | 21 |  |  | 21 |
Related to assets sold during the year | — |  |  | — |  |  | — |
Sales | (5,711 | ) |  | (98 | ) |  | (5,809 | )
Purchases | — |  |  | 108 |  |  | 108 |
Impact of foreign currency | 117 |  |  | 183 |  |  | 300 |
Balance at December 31, 2017 | $ | — |  |  | $ | 1,514 |  |  | $ | 1,514 |
Schedule of Expected Benefit Payments |
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Other Benefits Net of Subsidy |  | Total
2018 | $ | 7,972 |  |  | $ | 45,118 |  |  | $ | 411 |  |  | $ | 53,501 |
2019 | 8,140 |  |  | 43,125 |  |  | 400 |  |  | 51,665 |
2020 | 8,344 |  |  | 45,352 |  |  | 265 |  |  | 53,961 |
2021 | 8,453 |  |  | 42,561 |  |  | 249 |  |  | 51,263 |
2022 | 8,641 |  |  | 43,990 |  |  | 227 |  |  | 52,858 |
2023-2028 | 43,855 |  |  | 219,011 |  |  | 769 |  |  | 263,635 |

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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