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Reportable Segments and Geographic Areas Information - Reportable Segment Financial Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Additions to property, plant and equipment from acquired business	$ 1.8	$ 20.3	$ 74.6

X

- Definition

Acquired property, plant and equipment.

+ References

No definition available.

+ Details

Name:	ame_AcquiredPropertyPlantAndEquipment
Namespace Prefix:	ame_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration