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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.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of businesses acquired by the entity during the period.

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Business Acquisitions and Assets and Liabilities Held for Sale (Narrative) (Details) $ in Millions			3 Months Ended		9 Months Ended
	Apr. 18, 2019 USD ($)	Feb. 05, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) acquisition	Sep. 30, 2018 USD ($)	Oct. 29, 2019 USD ($)	Aug. 22, 2019	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Number of business acquisitions \| acquisition					3
Acquisition consideration					$ 2,352.5
Goodwill	$ 1,424.9		$ 10,746.7		10,746.7				$ 9,346.8
Intangible assets acquired	1,165.5
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of business			$ 0.0	$ 0.0	$ 119.6	$ 0.0
Disposal group, not discontinued operations \| Gatan, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred tax liability, book basis over tax basis									$ 10.0
Customer related intangibles
Business Acquisition [Line Items]
Intangible assets acquired	$ 1,005.3
Weighted average useful life of intangible assets acquired	15 years 9 months 18 days
Technology
Business Acquisition [Line Items]
Intangible assets acquired	$ 107.6
Weighted average useful life of intangible assets acquired	6 years 9 months 18 days
Thermo Fisher \| Disposal group, not discontinued operations \| Gatan, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of shares agreed to be sold										100.00%
Sale of business, consideration										$ 925.0
Teledyne \| Disposal group, not discontinued operations \| Imaging businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, consideration		$ 225.0
Gain on disposal of business		119.6
Gain on disposal of business, tax expense		$ 32.2
Subsequent event \| AMETEK \| Disposal group, not discontinued operations \| Gatan, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, consideration							$ 925.0
Foundry
Business Acquisition [Line Items]
Percentage of shares acquired	100.00%
iPipeline
Business Acquisition [Line Items]
Percentage of shares acquired								100.00%