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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