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Note 7 - Dispositions and Discontinued Operations - Divestitures and Business Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Feb. 01, 2023 | Dec. 31, 2022
Total current assets: | $ 0.0 |  | $ 0.0 |  |  | $ 362.6
Total noncurrent assets | 0.0 |  | 0.0 |  |  | 2,728.6
Current liabilities held-for-sale | 0.0 |  | 0.0 |  |  | 282.3
Noncurrent liabilities held-for-sale | 0.0 |  | 0.0 |  |  | 177.6
Environmental Health and Safety Business [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  | $ 86.3 |
Accounts receivable, net |  |  |  |  | 187.1 |
Prepaid expenses |  |  |  |  | 17.6 |
Other current assets |  |  |  |  | 13.8 |
Total current assets: |  |  |  |  | 304.8 |
Fixed assets, net |  |  |  |  | 165.2 |
Operating lease right-of-use assets, net |  |  |  |  | 29.7 |
Intangible assets, net |  |  |  |  | 625.9 |
Goodwill |  |  |  |  | 2,165.7 |
Other noncurrent assets |  |  |  |  | 18.9 |
Total noncurrent assets |  |  |  |  | 3,005.4 |
Total assets held for sale |  |  |  |  | 3,310.2 |
Net impairment of asset group(1) |  |  |  |  | (227.8) |
Total assets held for sale, net |  |  |  |  | 3,082.4 |
Accounts payable and accrued liabilities |  |  |  |  | 77.6 |
Operating lease liabilities |  |  |  |  | 7.6 |
Deferred revenues |  |  |  |  | 207.4 |
Income taxes payable |  |  |  |  | 13.6 |
Current liabilities held-for-sale |  |  |  |  | 306.2 |
Deferred income tax liabilities |  |  |  |  | 146.2 |
Noncurrent lease liabilities |  |  |  |  | 30.0 |
Other noncurrent liabilities |  |  |  |  | 2.5 |
Noncurrent liabilities held-for-sale |  |  |  |  | 178.7 |
Total liabilities held for sale |  |  |  |  | $ 484.9 |
Verisk Financial Services [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  | 180.2
Accounts receivable, net |  |  |  |  |  | 150.8
Prepaid expenses |  |  |  |  |  | 17.8
Other current assets |  |  |  |  |  | 13.8
Total current assets: |  |  |  |  |  | 362.6
Fixed assets, net |  |  |  |  |  | 157.1
Operating lease right-of-use assets, net |  |  |  |  |  | 29.8
Intangible assets, net |  |  |  |  |  | 616.9
Goodwill |  |  |  |  |  | 2,136.3
Other noncurrent assets |  |  |  |  |  | 16.3
Total noncurrent assets |  |  |  |  |  | 2,956.4
Total assets held for sale |  |  |  |  |  | 3,319.0
Net impairment of asset group(1) |  |  |  |  |  | (227.8)
Total assets held for sale, net |  |  |  |  |  | 3,091.2
Accounts payable and accrued liabilities |  |  |  |  |  | 68.6
Operating lease liabilities |  |  |  |  |  | 6.9
Deferred revenues |  |  |  |  |  | 176.6
Income taxes payable |  |  |  |  |  | 30.2
Current liabilities held-for-sale |  |  |  |  |  | 282.3
Deferred income tax liabilities |  |  |  |  |  | 144.1
Noncurrent lease liabilities |  |  |  |  |  | 30.8
Other noncurrent liabilities |  |  |  |  |  | 2.7
Noncurrent liabilities held-for-sale |  |  |  |  |  | 177.6
Total liabilities held for sale |  |  |  |  |  | $ 459.9
Energy Business [Member] | Discontinued Operations, Held-for-Sale [Member] |  |  |  |  |  |
Revenues | 0.0 | $ 135.2 | 46.8 | $ 400.6 |  |
Cost of revenues (exclusive of items shown separately below) | 0.0 | 51.6 | 18.2 | 154.0 |  |
Selling, general and administrative | 0.0 | 29.4 | 33.1 | 86.4 |  |
Depreciation and amortization of fixed assets | 0.0 | 10.2 | 0.0 | 30.0 |  |
Amortization of intangible assets | 0.0 | 18.6 | 0.0 | 63.5 |  |
Other operating loss, net | 0.0 | 2.5 | 135.3 | 2.5 |  |
Total operating expenses | 0.0 | 112.3 | 186.6 | 336.4 |  |
Operating income (loss) | 0.0 | 22.9 | (139.8) | 64.2 |  |
Investment income (loss) and others, net | 0.0 | 3.6 | (5.5) | 10.8 |  |
Income (loss) from discontinued operations before income taxes | 0.0 | 26.5 | (145.3) | 75.0 |  |
Income tax expense | 0.0 | (2.8) | (0.2) | (8.3) |  |
Income (loss) from discontinued operations, net of income taxes | 0.0 | 23.7 | (145.5) | 66.7 |  |
Depreciation and amortization of fixed assets | 0.0 | 10.2 | 0.0 | 30.0 |  |
Amortization of intangible assets | 0.0 | 18.6 | 0.0 | 63.5 |  |
Operating lease right-of-use assets, net | 0.0 | (1.1) | 0.1 | 7.1 |  |
Capital expenditures | $ 0.0 | $ (18.3) | $ (6.5) | $ (48.2) |  |

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