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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2024

Defined Benefit Plan [Abstract]

Schedule of Defined Benefit Plans Disclosures

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total
			2024						2023						2024						2023						2024						2023						2024						2023
Change in benefit obligation:
Benefit obligation at beginning of year			$	108,546					$	110,293					$	917,321					$	785,295					$	614					$	670					$	1,026,481					$	896,258
Service cost, gross			1,587						1,155						35,403						33,159						—						—						36,990						34,314
Interest cost			4,766						5,023						17,792						19,991						26						28						22,584						25,042
Actuarial losses (gains)			(6,473)						552						69,564						65,734						13						372						63,104						66,658
Plan amendments and other			—						—						101						—						—						—						101						—
Benefits paid			(8,545)						(8,477)						(53,103)						(53,164)						(132)						(456)						(61,780)						(62,097)
Impact of foreign currency			—						—						(62,209)						66,306						—						—						(62,209)						66,306
Benefit obligation at end of year			$	99,881					$	108,546					$	924,869					$	917,321					$	521					$	614					$	1,025,271					$	1,026,481
Change in plan assets:
Fair value of plan assets at beginning of year			$	86,061					$	87,341					$	1,010,177					$	894,865					$	—					$	—					$	1,096,238					$	982,206
Actual return on plan assets			7,788						7,083						64,883						38,133						—						—						72,671						45,216
Employer contributions			5,216						114						26,088						26,414						132						456						31,436						26,984
Plan participants’ contributions			—						—						19,287						19,214						—						—						19,287						19,214
Benefits paid			(8,545)						(8,477)						(53,103)						(53,164)						(132)						(456)						(61,780)						(62,097)
Impact of foreign currency			—						—						(69,903)						84,715						—						—						(69,903)						84,715
Fair value of plan assets at end of year			$	90,520					$	86,061					$	997,429					$	1,010,177					$	—					$	—					$	1,087,949					$	1,096,238
Funded status			$	(9,361)					$	(22,485)					$	72,560					$	92,856					$	(521)					$	(614)					$	62,678					$	69,757

The change in the benefit obligation for 2024 is primarily related to a decrease of the non-U.S. discount rates and currency translation, offset in part by higher asset returns.

Schedule of Amounts Recognized in Balance Sheet

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total
			2024						2023						2024						2023						2024						2023						2024						2023
Other non-current assets			$	—					$	—					$	174,006					$	202,119					$	—					$	—					$	174,006					$	202,119
Accrued and other liabilities			(139)						(124)						(5,201)						(5,368)						(94)						(106)						(5,434)						(5,598)
Pension and other post-retirement liabilities			(9,223)						(22,361)						(95,276)						(103,895)						(426)						(508)						(104,925)						(126,764)
Accumulated other comprehensive loss (income)			36,760						47,631						238,408						222,346						74						19						275,242						269,996
Total			$	27,398					$	25,146					$	311,937					$	315,202					$	(446)					$	(595)					$	338,889					$	339,753

Schedule of Net Periodic Benefit Cost Not yet Recognized

			U.S. Pension Benefits												Non-U.S. Pension Benefits												Other Benefits												Total												Total, After Tax
			2024						2023						2024						2023						2024						2023						2024						2023						2024						2023
Plan amendments and prior service cost			$	—					$	—					$	(16,140)					$	(21,755)					$	(202)					$	(276)					$	(16,342)					$	(22,031)					$	(13,188)					$	(18,212)
Actuarial losses (gains)			36,760						47,631						254,548						244,101						276						295						291,584						292,027						232,056						$	231,446
Total			$	36,760					$	47,631					$	238,408					$	222,346					$	74					$	19					$	275,242					$	269,996					$	218,868					$	213,234

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)			$	(8,789)					$	41,766					$	13					$	32,990					$	26,769
Plan amendment			—						—						—						—						—
Amortization of:
Actuarial (losses) gains			(2,082)						(14,343)						(32)						(16,457)						(13,060)
Plan amendments and prior service cost			—						3,987						75						4,062						3,257
Impact of foreign currency			—						(14,835)						—						(14,835)						(11,236)
Total			$	(10,871)					$	16,575					$	56					$	5,760					$	5,730

Schedule of Assumptions Used in Computing Benefit Obligation

			U.S.												Non-U.S.
			2024						2023						2024						2023
Discount rate			5.34		%				4.68		%				1.57		%				2.07		%
Compensation increase rate			n/a						n/a						0.81		%				0.84		%
Expected long-term rate of return on plan assets			6.75		%				6.75		%				4.06		%				3.84		%
Interest crediting rate			n/a						n/a						1.50		%				1.50		%

Schedule of Assumptions Used in Computing Pension Cost

			U.S.																		Non-U.S.
			2024						2023						2022						2024						2023						2022
Discount rate			4.68		%				4.87		%				2.57		%				2.07		%				2.57		%				0.40		%
Compensation increase rate			n/a						n/a						n/a						0.84		%				0.87		%				0.85		%
Expected long-term rate of return on plan assets			6.75		%				6.75		%				5.75		%				3.84		%				3.84		%				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 Benefits																		Total
			2024						2023						2022						2024						2023						2022						2024						2023						2022						2024						2023						2022
Service cost, net			$	1,587					$	1,155					$	1,665					$	16,116					$	13,945					$	19,040					$	—					$	—					$	—					$	17,703					$	15,100					$	20,705
Interest cost on projected benefit obligations			4,766						5,023						2,696						17,792						19,991						5,927						26						28						12						22,584						25,042						8,635
Expected return on plan assets			(5,472)						(5,532)						(6,189)						(37,084)						(34,675)						(36,308)						—						—						—						(42,556)						(40,207)						(42,497)
Recognition of actuarial losses/(gains) and prior service cost			2,082						2,192						2,337						10,356						6,061						14,665						(43)						(76)						(106)						12,395						8,177						16,896
Net periodic pension cost/(benefit)			$	2,963					$	2,838					$	509					$	7,180					$	5,322					$	3,324					$	(17)					$	(48)					$	(94)					$	10,126					$	8,112					$	3,739

Schedule of Allocation of Plan Assets

			December 31, 2024																								December 31, 2023
			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			$	48,420					$	—					$	—					$	48,420					$	48,710					$	—					$	—					$	48,710
Equity Securities:
Mettler-Toledo Stock			2,632						—						—						2,632						2,606						—						—						2,606
Equity Mutual Funds:
U.S.(1)			5,948						25,324						—						31,272						5,831						24,856						—						30,687
International(2)			290,027						9,802						—						299,829						294,703						10,314						—						305,017
Emerging Markets(3)			20,536						—						—						20,536						19,941						—						—						19,941
Fixed Income Securities:
Corporate/Government Bonds(4)			92,878						—						—						92,878						91,495						—						—						91,495
Fixed Income Mutual Funds:
Insurance Contracts(5)			—						24,493						2,073						26,566						—						25,458						1,972						27,430
Core Bond(6)			134,891						54,771						—						189,662						144,948						57,286						—						202,234
Real Asset Mutual Funds:
Real Estate(7)			—						183,332						—						183,332						—						186,804						—						186,804
Commodities(8)			62,401						—						—						62,401						50,109						—						—						50,109
Other Types of Investments:
Debt Securities (9)			41,989						—						—						41,989						45,156						—						—						45,156
Global Allocation Funds(10)			4,505						—						—						4,505						4,326						—						—						4,326
Multi-Strategy Fund of Hedge Funds (11)			—						20,837						—						20,837						—						22,336						—						22,336
Insurance Linked Securities(12)			669						—						—						669						2,870						—						—						2,870
Total assets in fair value hierarchy			$	704,896					$	318,559					$	2,073					$	1,025,528					$	710,695					$	327,054					$	1,972					$	1,039,721
Investments measured at net asset value:
Emerging Markets (13)																					6,093																								6,444
Multi-Strategy Fund of Hedge Funds (13)																					56,328																								50,073
Total pension assets at fair value																					$	1,087,949																							$	1,096,238

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

			Insurance Contracts
Balance at December 31, 2022			$	1,775
Actual return on plan assets related to assets held at end of year			31
Purchases			91
Impact of foreign currency			75
Balance at December 31, 2023			$	1,972
Actual return on plan assets related to assets held at end of year			42
Purchases			159
Sales			(8)
Impact of foreign currency			(92)
Balance at December 31, 2024			$	2,073

Schedule of Expected Benefit Payments

			U.S. Pension Benefits						Non-U.S. Pension Benefits						Other Benefits, Net of Subsidy						Total
2025			$	8,769					$	53,191					$	94					$	62,054
2026			8,757						52,880						83						61,720
2027			8,720						54,310						73						63,103
2028			8,665						54,924						64						63,653
2029			8,567						56,553						56						65,176
2030-2034			39,728						267,027						183						306,938

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