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Note 10 - Acquisitions (Details Textual) - USD ($) $ in Millions															12 Months Ended
		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. 14, 2018	Jun. 20, 2018	Feb. 21, 2018	Jan. 05, 2018	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Escrow Deposit															$ 18.5		$ 10.5
Goodwill, Ending Balance															4,108.1		3,864.3	$ 3,361.5
Escrow Release															0.8		25.2
Current Portion of Escrow															1.7		0.5
Business Combination, Contingent Consideration, Liability, Current															0.6		111.2
Business Combination, Contingent Consideration, Liability, Noncurrent															0.2		0.2
Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs															2.2		3.0
Jornaya Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred, Total		$ 125.2
Escrow Deposit		$ 1.3
Franco Signor [Member]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Combination, Consideration Transferred, Total			$ 159.9
Escrow Deposit			8.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash			5.7												5.7	[1]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Offsetting Liability Included Within Current Liabilities			$ 5.7
Goodwill, Ending Balance															100.3
2020 Acquisitions [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash	[1]														5.7
Goodwill, Ending Balance															171.7
Business Acquisition, Goodwill Non-tax Deductible, Amount															$ 20.8
Flexible Architecture and Simplified Technology LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Business Combination, Consideration Transferred, Total				$ 193.9
Escrow Deposit				$ 1.9
Goodwill, Ending Balance																	120.7
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%
Business Combination, Consideration Transferred, Total						$ 351.0
Goodwill, Ending Balance																	241.4
BuildFax Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Business Combination, Consideration Transferred, Total							$ 40.2
Goodwill, Ending Balance																	20.2
Business Combination, Holdback Amount							$ 1.0
Property Pres Wizard, LLC. [Member]
Business Combination, Consideration Transferred, Total								$ 15.0
Escrow Deposit								$ 1.5
Keystone Aerial Surveys, Inc. [Member]
Business Acquisition, Percentage of Voting Interests Acquired									100.00%
Business Combination, Consideration Transferred, Total									$ 29.4
Escrow Deposit									$ 2.7
Content As a Service Business [Member]
Business Combination, Consideration Transferred, Total										$ 65.2
2019 Acquisitions [Member]
Goodwill, Ending Balance																	451.7
Business Acquisition, Goodwill Non-tax Deductible, Amount																	$ 307.1	99.5
Business Combination, Acquisition Related Costs																		1.5
Rulebook [Member]
Business Combination, Consideration Transferred, Total											$ 86.5
Escrow Deposit											$ 8.6
Goodwill, Ending Balance																		58.9
Validus-IVC Limited [Member]
Business Acquisition, Percentage of Voting Interests Acquired												100.00%
Business Combination, Consideration Transferred, Total												$ 46.1
Escrow Deposit												$ 5.9
Goodwill, Ending Balance																		$ 24.8
Business Insight Limited [Member]
Business Acquisition, Percentage of Voting Interests Acquired													100.00%
Business Combination, Consideration Transferred, Total													$ 18.0
Marketview Limited [Member]
Business Acquisition, Percentage of Voting Interests Acquired														100.00%
Business Combination, Consideration Transferred, Total														$ 4.0
Escrow Deposit														$ 0.4
[1] Within cash and cash equivalents, there is $5.7 million of restricted cash related to Franco Signor's professional administrative services for Medicare Set Asides, with an offsetting liability of $5.7 million included within current liabilities.

X

- Definition

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

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X

- Definition

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

+ References

No definition available.

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Amount of holdback for business combination.

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- Definition

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

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No definition available.

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- Definition

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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