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

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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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 liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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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 cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The amount of goodwill that is non-tax deductible in a business acquisition.

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Amount of holdback for business combination.

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Amount of offsetting liability included within current liabilities at the acquisition date.

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No definition available.

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The amount of restricted cash recognized as of the acquisition date.

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The designation of funds expected to be paid during the twelve-month period following the balance sheet date which is furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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This element represents cash activity associated with escrow release in connection with an acquisition.

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Note 10 - Acquisitions (Details Textual) - USD ($) $ in Millions															12 Months Ended
	Dec. 23, 2021	Nov. 02, 2021	Sep. 01, 2021	Jun. 17, 2021	Mar. 02, 2021	Dec. 16, 2020	Sep. 09, 2020	Dec. 23, 2019	Dec. 19, 2019	Nov. 05, 2019	Oct. 10, 2019	Aug. 28, 2019	Jul. 31, 2019	Mar. 29, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2024
Payments to Acquire Businesses, Net of Cash Acquired, Total															$ 289.8	$ 275.8	$ 699.2
Escrow Deposit															4.7	18.5
Goodwill, Ending Balance															4,331.2	4,108.1	3,864.3
Escrow Release															12.1	0.8
Current Portion of Escrow															10.6	1.5
Business Combination, Contingent Consideration, Liability, Current															0.5	0.6
Business Combination, Contingent Consideration, Liability, Noncurrent															21.7	0.2
ACTINEO [Member]
Business Acquisition, Percentage of Voting Interests Acquired	96.70%
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 148.9														148.9
Goodwill, Ending Balance															121.9
Data Driven Safety, LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 93.5													93.5
Escrow Deposit		$ 2.0
Goodwill, Ending Balance															73.7
Ignite Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 13.8
RoskillAcquisitionMember
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 22.1
Escrow Deposit				$ 4.8
Whitespace Software Limited [Member]
Business Acquisition, Percentage of Voting Interests Acquired					51.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total					$ 16.8
Whitespace Software Limited [Member] \| Forecast [Member]
Business Acquisition, Percentage of Voting Interests Acquired																		49.00%
The 2021 Acquisitions [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total															299.0
Goodwill, Ending Balance															257.1
Business Acquisition, Goodwill Non-tax Deductible, Amount															182.5
The 2021 Acquisitions [Member] \| Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs															$ 2.8
Jornaya Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired						100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total						$ 124.9
Franco Signor [Member]
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total							$ 159.7									124.9
Escrow Deposit							8.0
Goodwill, Ending Balance																69.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash							5.7									0.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Offsetting Liability Included Within Current Liabilities							$ 5.7
2020 Acquisitions [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total																284.6
Goodwill, Ending Balance																171.4
Business Acquisition, Goodwill Non-tax Deductible, Amount																90.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash																(5.7)
2020 Acquisitions [Member] \| Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs																$ 2.2
Flexible Architecture and Simplified Technology LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired								100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total																	193.9
Escrow Deposit								$ 1.9
Goodwill, Ending Balance																	120.7
Business Combination, Consideration Transferred, Total								$ 193.9
Commerce Signals Inc. [Member]
Business Combination, Consideration Transferred, Total									$ 3.9
Business Combination, Holdback Amount									$ 1.1
Genscape, Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired										100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total																	351.0
Goodwill, Ending Balance																	241.4
Business Combination, Consideration Transferred, Total										$ 351.0
BuildFax Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired											100.00%
Payments to Acquire Businesses, Net of Cash Acquired, Total																	40.2
Goodwill, Ending Balance																	20.2
Business Combination, Consideration Transferred, Total											$ 40.2
Business Combination, Holdback Amount											$ 1.0
Property Pres Wizard, LLC. [Member]
Escrow Deposit												$ 1.5
Business Combination, Consideration Transferred, Total												$ 15.0
Keystone Aerial Surveys, Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired													100.00%
Escrow Deposit													$ 2.7
Business Combination, Consideration Transferred, Total													$ 29.4
Content As a Service Business [Member]
Business Combination, Consideration Transferred, Total														$ 65.2
2019 Acquisitions [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total																	698.6
Goodwill, Ending Balance																	451.7
Business Acquisition, Goodwill Non-tax Deductible, Amount																	307.1
2019 Acquisitions [Member] \| Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs																	$ 3.0