Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accumulated Translation Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance	$ (133,503)	$ (117,230)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(55,984)	(12,677)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	(55,984)	(12,677)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(189,487)	(129,907)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance	(3,920)	120
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17,013)	4,448
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	16,781	(8,767)
Other Comprehensive Income (Loss), Net of Tax	(232)	(4,319)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(4,152)	(4,199)
Accumulated Defined Benefit Plans Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance	(208,435)	(202,705)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(23,390)	1,677
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9,529	7,352
Other Comprehensive Income (Loss), Net of Tax	(13,861)	9,029
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(222,296)	(193,676)
AOCI Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance	(345,858)	(319,815)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17,013)	4,448
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(79,374)	(11,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	26,310	(1,415)
Other Comprehensive Income (Loss), Net of Tax	(70,077)	(7,967)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (415,935)	$ (327,782)

METTLER TOLEDO INTERNATIONAL INC/ 10-Q