XML 92 R78.htm IDEA: XBRL DOCUMENT
v3.20.4

Retirement Plans and Other Postretirement Benefits - Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 913,034 | $ 845,979
U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 662,298 | 621,632
U.S. Defined Benefit Pension Plans | Municipal bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 876 | 574
U.S. Defined Benefit Pension Plans | Corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,442 | 3,152
U.S. Defined Benefit Pension Plans | Corporate debt instruments – Preferred |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 12,196 | 10,781
U.S. Defined Benefit Pension Plans | Corporate stocks – Common |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 62,897 | 127,221
U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 526 | 240
U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 316,467 | 430,044
U.S. Defined Benefit Pension Plans | Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 345,831 | 191,588
U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 236,530 | 288,076
Level 1 | U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 299,427 | 415,297
Level 1 | U.S. Defined Benefit Pension Plans | Corporate stocks – Common |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 62,897 | 127,221
Level 1 | U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Level 1 | U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 299,427 | 415,297
Level 1 | U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 236,530 | 288,076
Level 2 | U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 17,040 | 14,747
Level 2 | U.S. Defined Benefit Pension Plans | Municipal bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 876 | 574
Level 2 | U.S. Defined Benefit Pension Plans | Corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,442 | 3,152
Level 2 | U.S. Defined Benefit Pension Plans | Corporate debt instruments – Preferred |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 12,196 | 10,781
Level 2 | U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 526 | 240
Level 2 | U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 17,040 | $ 14,747
Level 2 | U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=ame_CorporateDebtSecuritiesPreferredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=ame_CorporateCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=ame_UsGovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=ame_InvestmentsMeasuredAtNetAssetValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=ame_RegisteredInvestmentCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |