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Note 17 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2021 | Oct. 19, 2021 | Oct. 01, 2021 | Sep. 01, 2021 | Jul. 01, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  | 1,749,644 |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  | $ 17.9 | $ 151.9 | $ 49.4 | $ 151.9
Subsequent Event [Member] | ACTINEO [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 96.70% |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 135.0 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Data Driven Safety, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 93.2 |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Indemnity Escrows | $ 2.0 |  |  |  |  |  |  |  |  |  |
June 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  | $ 75.0 | $ 150.0 |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  | 111,429 | 686,813 |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  | $ 174.72 |  |  |  |  |  |
June 2021 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  | 299,595 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  | $ 200.27 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  | $ 60.0 |  |  |  |  |  |  |  |

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- Definition The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition The number of shares at initial price for accelerated share repurchases. + References No definition available. + Details
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- Definition The purchase price of accelerated share repurchases. + References No definition available. + Details
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