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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 |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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