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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Defined Benefit Plan [Abstract]  
Schedule of Defined Benefit Plans Disclosures
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther BenefitsTotal
 20232022202320222023202220232022
Change in benefit obligation:      
Benefit obligation at beginning of year
$110,293 $141,906 $785,295 $1,027,333 $670 $875 $896,258 $1,170,114 
Service cost, gross1,155 1,665 33,159 36,640 — — 34,314 38,305 
Interest cost5,023 2,696 19,991 5,927 28 12 25,042 8,635 
Actuarial losses (gains)552 (27,541)65,734 (219,304)372 206 66,658 (246,639)
Plan amendments and other— — — 13 — — — 13 
Benefits paid(8,477)(8,433)(53,164)(34,949)(456)(423)(62,097)(43,805)
Impact of foreign currency— — 66,306 (30,365)— — 66,306 (30,365)
Benefit obligation at end of year
$108,546 $110,293 $917,321 $785,295 $614 $670 $1,026,481 $896,258 
Change in plan assets:      
Fair value of plan assets at beginning of year
$87,341 $113,523 $894,865 $1,008,261 $— $— $982,206 $1,121,784 
Actual return on plan assets7,083 (17,863)38,133 (96,866)— — 45,216 (114,729)
Employer contributions114 114 26,414 24,441 456 423 26,984 24,978 
Plan participants’ contributions
— — 19,214 17,600 — — 19,214 17,600 
Benefits paid(8,477)(8,433)(53,164)(34,949)(456)(423)(62,097)(43,805)
Impact of foreign currency— — 84,715 (23,622)— — 84,715 (23,622)
Fair value of plan assets at end of year
$86,061 $87,341 $1,010,177 $894,865 $— $— $1,096,238 $982,206 
Funded status$(22,485)$(22,952)$92,856 $109,570 $(614)$(670)$69,757 $85,948 
Schedule of Amounts Recognized in Balance Sheet
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther BenefitsTotal
 20232022202320222023202220232022
Other non-current assets$— $— $202,119 $202,368 $— $— $202,119 $202,368 
Accrued and other liabilities(124)(131)(5,368)(4,986)(106)(115)(5,598)(5,232)
Pension and other post-retirement liabilities
(22,361)(22,821)(103,895)(90,342)(508)(555)(126,764)(113,718)
Accumulated other comprehensive loss (income)
47,631 50,822 222,346 151,924 19 (430)269,996 202,316 
Total$25,146 $27,870 $315,202 $258,964 $(595)$(1,100)$339,753 $285,734 
Schedule of Net Periodic Benefit Cost Not yet Recognized
U.S. Pension
Benefits		Non-U.S. Pension
Benefits		Other BenefitsTotalTotal, After Tax
2023202220232022202320222023202220232022
Plan amendments and prior service cost$— $— $(21,755)$(24,701)$(276)$(351)$(22,031)$(25,052)$(18,212)$(20,237)
Actuarial losses (gains)47,631 50,822 244,101 176,625 295 (79)292,027 227,368 231,446 $180,278 
Total$47,631 $50,822 $222,346 $151,924 $19 $(430)$269,996 $202,316 $213,234 $160,041 
Schedule of Changes in Accumulated Postemployment Benefit Obligations
U.S. Pension
Benefits		Non-U.S. Pension
Benefits		Other BenefitsTotalTotal, After Tax
Net actuarial losses (gains)$(999)$62,592 $372 $61,965 $48,800 
Plan amendment— — — — — 
Amortization of:
Actuarial (losses) gains(2,192)(10,448)2 (12,638)(10,010)
Plan amendments and prior service cost— 4,323 75 4,398 3,528 
Impact of foreign currency— 13,955 — 13,955 11,762 
Total$(3,191)$70,422 $449 $67,680 $54,080 
Schedule of Assumptions Used in Computing Benefit Obligation
 U.S.Non-U.S.
 2023202220232022
Discount rate4.68 %4.87 %2.07 %2.57 %
Compensation increase raten/an/a0.84 %0.87 %
Expected long-term rate of return on plan assets6.75 %6.75 %3.84 %3.84 %
Interest crediting raten/an/a1.50 %1.50 %
Schedule of Assumptions Used in Computing Pension Cost
 U.S.Non-U.S.
 202320222021202320222021
Discount rate4.87 %2.57 %2.22 %2.57 %0.40 %0.63 %
Compensation increase raten/an/an/a0.87 %0.85 %0.85 %
Expected long-term rate of return on plan assets6.75 %5.75 %5.75 %3.84 %3.78 %3.78 %
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
202320222021202320222021202320222021202320222021
Service cost, net$1,155 $1,665 $1,498 $13,945 $19,040 $19,558 $— $— $— $15,100 $20,705 $21,056 
Interest cost on projected benefit obligations
5,023 2,696 2,194 19,991 5,927 3,347 28 12 8 25,042 8,635 5,549 
Expected return on plan assets(5,532)(6,189)(5,974)(34,675)(36,308)(35,511)— — — (40,207)(42,497)(41,485)
Recognition of actuarial losses/(gains) and prior service cost2,192 2,337 2,916 6,061 14,665 21,725 (76)(106)(112)8,177 16,896 24,529 
Net periodic pension cost/(benefit)$2,838 $509 $634 $5,322 $3,324 $9,119 $(48)$(94)$(104)$8,112 $3,739 $9,649 
Schedule of Allocation of Plan Assets
 December 31, 2023December 31, 2022
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$48,710 $— $— $48,710 $99,535 $— $— $99,535 
Equity Securities:        
Mettler-Toledo Stock2,606 — — 2,606 3,107 — — 3,107 
Equity Mutual Funds:        
U.S.(1)
5,831 24,856 — 30,687 5,753 24,133 — 29,886 
International(2)
294,703 10,314 — 305,017 89,247 9,496 — 98,743 
Emerging Markets(3)
19,941 — — 19,941 127,506 — — 127,506 
Fixed Income Securities:        
Corporate/Government Bonds(4)
91,495 — — 91,495 79,221 — — 79,221 
Fixed Income Mutual Funds:       
Insurance Contracts(5)
— 25,458 1,972 27,430 — 25,126 1,775 26,901 
Core Bond(6)
144,948 57,286 — 202,234 73,315 62,956 — 136,271 
Real Asset Mutual Funds:        
Real Estate(7)
— 186,804 — 186,804 — 167,693 — 167,693 
Commodities(8)
50,109 — — 50,109 49,603 — — 49,603 
Other Types of Investments:        
Debt Securities (9)
45,156 — — 45,156 41,099 — — 41,099 
Global Allocation Funds(10)
4,326 — — 4,326 4,370 — — 4,370 
Multi-Strategy Fund of Hedge Funds (11)
— 22,336 — 22,336 — 17,702 — 17,702 
Insurance Linked Securities(12)
2,870— — 2,870 13,243 — — 13,243 
Total assets in fair value hierarchy
$710,695 $327,054 $1,972 $1,039,721 $585,999 $307,106 $1,775 $894,880 
Investments measured at net asset value:
International(13)
— 2,409 
Emerging Markets (13)
6,4445,980
Multi-Strategy Fund of Hedge Funds (13)
50,07378,937
Total pension assets at fair value
$1,096,238 $982,206 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Insurance
Contracts
Balance at December 31, 2021$1,787 
Actual return on plan assets related to assets held at end of year(1)
Purchases80 
Impact of foreign currency(91)
Balance at December 31, 2022$1,775 
Actual return on plan assets related to assets held at end of year31 
Purchases91 
Impact of foreign currency75 
Balance at December 31, 2023$1,972 
Schedule of Expected Benefit Payments
U.S. Pension
Benefits		Non-U.S. Pension
Benefits		Other Benefits, Net of
Subsidy		Total
2024$8,674 $55,323 $106 $64,103 
20258,738 57,135 94 65,967 
20268,724 56,092 83 64,899 
20278,688 57,814 73 66,575 
20288,637 58,505 64 67,206 
2029-203340,720 284,418 213 325,351