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Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 09, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense |  | $ (49.7) | $ (35.4) | $ (129.2) | $ (96.0)
Disposed of by Sale | Knight LLC |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of businesses, net of cash remitted | $ 49.4 |  |  |  |
Gain on sale | $ 34.8 |  |  |  |
Income tax expense |  | $ (5.5) |  | $ (5.5) |

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