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Business Acquisitions and Dispositions (Details) $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 03, 2020 USD ($) | Oct. 29, 2019 USD ($) | Feb. 05, 2019 USD ($) | Jun. 04, 2018 USD ($) | Dec. 31, 2020 USD ($) acquisition | Dec. 31, 2019 USD ($) acquisition | Dec. 31, 2018 USD ($) acquisition | Aug. 22, 2019 | Apr. 18, 2019 | Jul. 10, 2018 | Jun. 07, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  | 6 |  |  |  |  |  |
Goodwill |  |  |  |  | $ 14,395.2 | $ 10,815.4 | $ 9,346.8 |  |  |  |
Gatan | AMETEK | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration receivable or received on disposal |  | $ 925.0 |  |  |  |  |  |  |  |  |
Pretax gain |  | 801.1 |  |  |  |  |  |  |  |  |
Income tax expense in connection with sale |  | $ 201.2 |  |  |  |  |  |  |  |  |
Imaging Businesses | Teledyne | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration receivable or received on disposal |  |  | $ 225.0 |  |  |  |  |  |  |  |
Pretax gain |  |  | 119.6 |  |  |  |  |  |  |  |
Income tax expense in connection with sale |  |  | $ 32.2 |  |  |  |  |  |  |  |
Vertafore |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 5,398.6 |  |  |  |  |  |  |  |  |  |
Business acquisition, enterprise value | 5,335.0 |  |  |  |  |  |  |  |  |  |
Purchase price | 120.0 |  |  |  |  |  |  |  |  |  |
Goodwill | 3,229.1 |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | 2,660.0 |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets | 2,540.0 |  |  |  |  |  |  |  |  |  |
Deferred tax assets (liabilities), net | (489.0) |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 638.0 |  |  |  |  |  |  |  |  |  |
Vertafore | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets | 120.0 |  |  |  |  |  |  |  |  |  |
Vertafore | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | $ 2,230.0 |  |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets | 17 years |  |  |  |  |  |  |  |  |  |
Vertafore | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | $ 310.0 |  |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets | 8 years |  |  |  |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  | 5 |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 612.8 |  |  |  |  |  |
Goodwill |  |  |  |  | 303.9 |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | 313.0 |  |  |  |  |  |
Other acquisitions | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | $ 283.7 |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  | 16 years |  |  |  |  |  |
Other acquisitions | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | $ 29.3 |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  | 5 years |  |  |  |  |  |
Acquisitions 2019 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  | 4 |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | $ 2,387.6 |  |  |  |  |
Goodwill |  |  |  |  |  | 1,447.0 |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  | 1,181.9 |  |  |  |  |
Acquisitions 2019 | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  | $ 1,020.0 |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  | 15 years 9 months 18 days |  |  |  |  |
Acquisitions 2019 | Unpatented technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  | $ 109.3 |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  | 6 years 9 months 18 days |  |  |  |  |
Foundry |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00% |  |
iPipeline |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  | 100.00% |  |  |
2018 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  |  | 7 |  |  |  |
Aggregate purchase price |  |  |  |  |  |  | $ 1,279.0 |  |  |  |
Goodwill |  |  |  |  |  |  | 717.5 |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  | 711.3 |  |  |  |
2018 Acquisitions | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  | $ 635.1 |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  |  | 19 years |  |  |  |
2018 Acquisitions | Unpatented technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  | $ 48.6 |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  |  | 7 years |  |  |  |
Quote Software, PlainSwift Software, and Smartbid |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  |  | 3 |  |  |  |
PowerPlan, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  | 100.00% |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 1,111.4 |  |  |  |  |  |  |
ConceptShare, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  | 100.00%
BillBlast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  | 100.00% |
Avitru |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 100.00% |  |  |  |

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