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Acquisitions and Discontinued Operations - Other Discontinued Operations Activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other businesses included in discontinued operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net loss recognized with disposition of business | $ 3.7 | $ 4.4 | $ 0.8

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