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Benefit Plans
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plan [Abstract]  
Schedule of Defined Benefit Plans Disclosures
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther BenefitsTotal
 20202019202020192020201920202019
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, gross1,304 1,063 33,995 30,665 — — 35,299 31,728 
Interest cost3,556 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 assets9,223 15,037 39,535 76,732 — — 48,758 91,769 
Employer contributions5,523 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)$(140,234)
Schedule of Amounts Recognized in Balance Sheet
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther BenefitsTotal
 20202019202020192020201920202019
Other non-current assets$— $— $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 BenefitsTotalTotal, 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 BenefitsTotalTotal, 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.
 2020201920202019
Discount rate2.22 %3.03 %0.32 %0.51 %
Compensation increase raten/an/a0.86 %0.86 %
Expected long-term rate of return on plan assets5.75 %6.25 %3.73 %3.76 %
Interest crediting riskn/an/a0.50 %0.80 %
Schedule of Assumptions Used in Computing Pension Cost
 U.S.Non-U.S.
 202020192018202020192018
Discount rate3.03 %4.11 %3.49 %0.51 %1.22 %0.97 %
Compensation increase raten/an/an/a0.86 %0.87 %0.87 %
Expected long-term rate of return on plan assets6.25 %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 BenefitsTotal
202020192018202020192018202020192018202020192018
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, 2020December 31, 2019
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)		Observable
Inputs for
Identical
Assets
(Level 2)		Unobservable
Inputs
(Level 3)		TotalQuoted
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 Stock3,767 — — 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)
2,9303,288 
Emerging Markets (12)
7,2626,650
Multi-Strategy Fund of Hedge Funds (12)
85,27654,397
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 year14 
Sales(54)
Purchases83 
Impact of foreign currency(18)
Balance at December 31, 2019$1,486 
Actual return on plan assets related to assets held at end of year22 
Purchases99 
Impact of foreign currency186 
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 
20228,507 48,687 128 57,322 
20238,666 49,242 110 58,018 
20248,750 50,370 98 59,218 
20258,778 50,415 87 59,280 
2026-203042,808 246,920 303 290,031