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)
|