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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2021

Defined Benefit Plan [Abstract]

Schedule of Defined Benefit Plans Disclosures

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total
			2021						2020						2021						2020						2021						2020						2021						2020
Change in benefit obligation:
Benefit obligation at beginning of year			$	149,947					$	142,450					$	1,091,811					$	961,263					$	1,030					$	1,295					$	1,242,788					$	1,105,008
Service cost, gross			1,498						1,304						35,675						33,995						—						—						37,173						35,299
Interest cost			2,194						3,556						3,347						4,778						8						25						5,549						8,359
Actuarial losses (gains)			(3,399)						10,733						1,904						43,508						37						(70)						(1,458)						54,171
Plan amendments and other			—						—						(23,196)						112						—						—						(23,196)						112
Benefits paid			(8,334)						(8,096)						(39,911)						(39,412)						(200)						(220)						(48,445)						(47,728)
Impact of foreign currency			—						—						(42,297)						87,567						—						—						(42,297)						87,567
Benefit obligation at end of year			$	141,906					$	149,947					$	1,027,333					$	1,091,811					$	875					$	1,030					$	1,170,114					$	1,242,788
Change in plan assets:
Fair value of plan assets at beginning of year			$	109,462					$	102,812					$	984,322					$	861,962					$	—					$	—					$	1,093,784					$	964,774
Actual return on plan assets			12,307						9,223						52,922						39,535						—						—						65,229						48,758
Employer contributions			88						5,523						27,088						26,249						200						220						27,376						31,992
Plan participants’ contributions			—						—						16,102						15,681						—						—						16,102						15,681
Benefits paid			(8,334)						(8,096)						(39,911)						(39,412)						(200)						(220)						(48,445)						(47,728)
Impact of foreign currency			—						—						(32,262)						80,307						—						—						(32,262)						80,307
Fair value of plan assets at end of year			$	113,523					$	109,462					$	1,008,261					$	984,322					$	—					$	—					$	1,121,784					$	1,093,784
Funded status			$	(28,383)					$	(40,485)					$	(19,072)					$	(107,489)					$	(875)					$	(1,030)					$	(48,330)					$	(149,004)

Schedule of Amounts Recognized in Balance Sheet

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total
			2021						2020						2021						2020						2021						2020						2021						2020
Other non-current assets			$	—					$	—					$	122,049					$	51,619					$	—					$	—					$	122,049					$	51,619
Accrued and other liabilities			(136)						(133)						(5,289)						(5,549)						(129)						(153)						(5,554)						(5,835)
Pension and other post-retirement liabilities			(28,246)						(40,353)						(135,833)						(153,559)						(746)						(877)						(164,825)						(194,789)
Accumulated other comprehensive loss (income)			56,648						69,296						259,714						332,280						(742)						(891)						315,620						400,685
Total			$	28,266					$	28,810					$	240,641					$	224,791					$	(1,617)					$	(1,921)					$	267,290					$	251,680

Schedule of Net Periodic Benefit Cost Not yet Recognized

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total												Total, After Tax
			2021						2020						2021						2020						2021						2020						2021						2020						2021						2020
Plan amendments and prior service cost			$	—					$	—					$	(29,446)					$	(9,857)					$	(426)					$	(501)					$	(29,872)					$	(10,358)					$	(24,118)					$	(8,262)
Actuarial losses (gains)			56,648						69,296						289,160						342,137						(316)						(390)						345,492						411,043						272,118						$	322,947
Total			$	56,648					$	69,296					$	259,714					$	332,280					$	(742)					$	(891)					$	315,620					$	400,685					$	248,000					$	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)			$	(9,732)					$	(15,507)					$	37					$	(25,202)					$	(19,293)
Plan amendment			—						(23,196)						—						(23,196)						(18,831)
Amortization of:
Actuarial (losses) gains			(2,916)						(24,899)						37						(27,778)						(21,958)
Plan amendments and prior service cost			—						3,174						75						3,249						2,632
Impact of foreign currency			—						(12,138)						—						(12,138)						(9,235)
Total			$	(12,648)					$	(72,566)					$	149					$	(85,065)					$	(66,685)

Schedule of Assumptions Used in Computing Benefit Obligation

			U.S.												Non-U.S.
			2021						2020						2021						2020
Discount rate			2.57		%				2.22		%				0.40		%				0.32		%
Compensation increase rate			n/a						n/a						0.85		%				0.86		%
Expected long-term rate of return on plan assets			5.75		%				5.75		%				3.78		%				3.73		%
Interest crediting rate			n/a						n/a						1.00		%				0.50		%

Schedule of Assumptions Used in Computing Pension Cost

			U.S.																		Non-U.S.
			2021						2020						2019						2021						2020						2019
Discount rate			2.22		%				3.03		%				4.11		%				0.63		%				0.51		%				1.22		%
Compensation increase rate			n/a						n/a						n/a						0.85		%				0.86		%				0.87		%
Expected long-term rate of return on plan assets			5.75		%				6.25		%				6.50		%				3.78		%				3.76		%				3.84		%

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
			2021						2020						2019						2021						2020						2019						2021						2020						2019						2021						2020						2019
Service cost, net			$	1,498					$	1,304					$	1,063					$	19,558					$	18,314					$	15,534					$	—					$	—					$	—					$	21,056					$	19,618					$	16,597
Interest cost on projected benefit obligations			2,194						3,556						4,585						3,347						4,778						10,192						8						25						64						5,549						8,359						14,841
Expected return on plan assets			(5,974)						(6,094)						(5,887)						(35,511)						(33,067)						(29,162)						—						—						—						(41,485)						(39,161)						(35,049)
Recognition of actuarial losses/(gains) and prior service cost			2,916						2,578						2,374						21,725						16,134						13,784						(112)						(103)						(691)						24,529						18,609						15,467
Net periodic pension cost/(benefit)			$	634					$	1,344					$	2,135					$	9,119					$	6,159					$	10,348					$	(104)					$	(78)					$	(627)					$	9,649					$	7,425					$	11,856

Schedule of Allocation of Plan Assets

			December 31, 2021																								December 31, 2020
			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			$	92,207					$	—					$	—					$	92,207					$	166,614					$	—					$	—					$	166,614
Equity Securities:
Mettler-Toledo Stock			3,639						—						—						3,639						3,767						—						—						3,767
Equity Mutual Funds:
U.S.(1)			8,197						43,287						—						51,484						7,467						30,460						—						37,927
International(2)			100,197						23,022						—						123,219						83,309						41,027						—						124,336
Emerging Markets(3)			157,814						3,315						—						161,129						131,103						966						—						132,069
Fixed Income Securities:
Corporate/Government Bonds(4)			87,772						—						—						87,772						92,085						—						—						92,085
Fixed Income Mutual Funds:
Insurance Contracts(5)			—						38,555						1,787						40,342						—						43,055						1,793						44,848
Core Bond(6)			107,394						71,608						—						179,002						72,061						64,111						—						136,172
Real Asset Mutual Funds:
Real Estate(7)			—						153,954						—						153,954						117,089						15,864						—						132,953
Commodities(8)			50,525						—						—						50,525						53,088						—						—						53,088
Other Types of Investments:
Debt Securities (9)			41,628						—						—						41,628						43,060						—						—						43,060
Global Allocation Funds(10)			5,680						—						—						5,680						12,359						—						—						12,359
Multi-Strategy Fund of Hedge Funds (11)			—						16,103						—						16,103						—						—						—						—
Insurance Linked Securities(12)			19,287						—						—						19,287						19,038						—						—						19,038
Total assets in fair value hierarchy			$	674,340					$	349,844					$	1,787					$	1,025,971					$	801,040					$	195,483					$	1,793					$	998,316
Investments measured at net asset value:
International(13)																					3,568																								2,930
Emerging Markets (13)																					7,211																								7,262
Multi-Strategy Fund of Hedge Funds (13)																					85,034																								85,276
Total pension assets at fair value																					$	1,121,784																							$	1,093,784

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

			Insurance Contracts
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
Actual return on plan assets related to assets held at end of year			26
Purchases			70
Impact of foreign currency			(102)
Balance at December 31, 2021			$	1,787

Schedule of Expected Benefit Payments

			U.S. Pension Benefits						Non-U.S. Pension Benefits						Other Benefits, Net of Subsidy						Total
2022			$	8,715					$	48,030					$	129					$	56,874
2023			8,789						48,345						111						57,245
2024			8,848						50,636						99						59,583
2025			8,859						49,528						88						58,475
2026			8,809						50,121						78						59,008
2027-2031			42,737						251,739						269						294,745

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Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

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