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Income Taxes (Earnings (Loss) Before Income Tax) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | $ (1,156.0) | $ 161.8 | $ (2,111.1)
Discontinued Operations |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | (237.2) | (426.4) | (499.9)
Continuing Operations | Domestic tax authority | U.K. |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | (831.0) | 330.9 | (991.3)
Continuing Operations | Foreign tax authority | The Netherlands |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | (662.8) | (321.1) | (26.1)
Continuing Operations | Foreign tax authority | Belgium |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | 409.3 | 392.4 | 140.0
Continuing Operations | Foreign tax authority | Switzerland |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | 178.5 | 318.8 | 111.6
Continuing Operations | Foreign tax authority | U.S. |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | (7.0) | (51.6) | (842.5)
Continuing Operations | Foreign tax authority | Other |  |  |
Income Tax Examination [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | $ (5.8) | $ (81.2) | $ (2.9)

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