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Business Acquisitions and Assets and Liabilities Held for Sale (Details) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
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Oct. 29, 2019 USD ($) | Feb. 05, 2019 USD ($) | Jun. 04, 2018 USD ($) | May 15, 2017 USD ($) | Dec. 31, 2019 USD ($) acquisition | Dec. 31, 2018 USD ($) acquisition | Dec. 31, 2017 USD ($) acquisition | Aug. 22, 2019 | Apr. 18, 2019 | Jul. 10, 2018 | Jun. 30, 2018 USD ($) | Jun. 07, 2018 | Nov. 17, 2017 $ / shares | Sep. 15, 2017 | Aug. 04, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 10,815.4 | $ 9,346.8 | $ 8,820.3 |  |  |  |  |  |  |  |
Gatan | Thermo Fisher | Disposal group, held-for-sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests to be sold |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Consideration receivable or received on disposal |  |  |  |  |  |  |  |  |  |  | $ 925.0 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Product line in Process Technologies segment | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration receivable or received on disposal |  |  |  | $ 10.4 |  |  |  |  |  |  |  |  |  |  |
Pretax gain |  |  |  | $ 9.4 |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 1,111.4 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
2017 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  | $ 152.0 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 82.7 |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  | 85.0 |  |  |  |  |  |  |  |
2017 Acquisitions | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  | $ 68.0 |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |
2017 Acquisitions | Unpatented technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  |  |  | $ 13.0 |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
Handshake Software, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Workbook Software A/S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Onvia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.00 |  |

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