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Discontinued Operations - Income for Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of tax | $ 220.3 | $ 6.1 | $ 6.4 | $ 6.4 | $ (4.1) | $ 5.0 | $ 8.1 | $ 6.0 | $ 239.2 | $ 15.0 | $ 55.5
Disposed of by held for sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 59.9 | 83.6 | 237.5
Cost of sales |  |  |  |  |  |  |  |  | 31.8 | 44.3 | 159.5
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 7.8 | 10.4 | 41.9
Amortization expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.3
Operating income |  |  |  |  |  |  |  |  | 20.3 | 28.9 | 33.8
Interest expense, net |  |  |  |  |  |  |  |  | 7.4 | 10.6 | 3.2
Other (income) expense, net |  |  |  |  |  |  |  |  | (0.8) |  |
Other (income) expense, net |  |  |  |  |  |  |  |  |  | 0.1 | 0.4
Income before income taxes |  |  |  |  |  |  |  |  | 13.7 | 18.2 | 30.2
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (1.3) | 3.2 | 9.0
Income from discontinued operations before gain on sale of businesses |  |  |  |  |  |  |  |  | 15.0 | 15.0 | 21.2
Gain on sale of business, net of taxes | $ 224.2 |  |  |  |  |  |  |  | 224.2 | 0.0 | 34.3
Depreciation expense, discontinued operations |  |  |  |  |  |  |  |  | 0.7 | 1.1 | 2.7
Assets disposed of by sales | Cryobiological products business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 7.4 | $ 10.6 |
Gain on sale of business, net of taxes |  |  |  |  |  |  |  |  | 224.2 |  |
Tax on gain on sale of business |  |  |  |  |  |  |  |  | $ 25.2 |  |
Assets disposed of by sales | BioMedical |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 3.2
Gain on sale of business, net of taxes |  |  |  |  |  |  |  |  |  |  | 34.3
Tax on gain on sale of business |  |  |  |  |  |  |  |  |  |  | $ 2.6

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