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Note 7 - Dispositions and Discontinued Operations - Divestitures and Business Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 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 | $ 133.5 | 46.8 | $ 265.4 |  |
Cost of revenues (exclusive of items shown separately below) | (0.1) | 50.5 | 18.2 | 102.4 |  |
Selling, general and administrative | 0.1 | 29.7 | 33.1 | 57.0 |  |
Depreciation and amortization of fixed assets | 0.0 | 10.3 | 0.0 | 19.8 |  |
Amortization of intangible assets | 0.0 | 21.5 | 0.0 | 44.9 |  |
Other operating loss, net | 6.9 | 0.0 | 135.3 | 0.0 |  |
Total operating expenses | 6.9 | 112.0 | 186.6 | 224.1 |  |
Operating (loss) income | (6.9) | 21.5 | (139.8) | 41.3 |  |
Investment (loss) income and others, net | (1.5) | 5.8 | (5.5) | 7.2 |  |
(Loss) income from discontinued operations before income taxes | (8.4) | 27.3 | (145.3) | 48.5 |  |
Income tax benefit (expense) | 0.9 | (3.1) | (0.2) | (5.5) |  |
(Loss) income from discontinued operations, net of income taxes | (7.5) | 24.2 | (145.5) | 43.0 |  |
Depreciation and amortization of fixed assets | 0.0 | 10.3 | 0.0 | 19.8 |  |
Amortization of intangible assets | 0.0 | 21.5 | 0.0 | 44.9 |  |
Operating lease right-of-use assets, net | 0.0 | 7.4 | 0.1 | 8.2 |  |
Capital expenditures | 0.0 | (17.1) | (6.5) | (29.9) |  |
Fixed assets included in accounts payable and accrued liabilities | $ 0.0 | $ 4.0 | $ 0.0 | $ 4.0 |  |

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