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Income Taxes (Tax Loss Carryforwards and Related Tax Assets) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | $ 24,049.1
Related tax asset | 4,367.5
U.K. |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 1,222.4
Related tax asset | 207.8
U.K. | Amount attributable to capital losses |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 16,052.0
Related tax asset | 2,728.8
The Netherlands |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 3,204.0
Related tax asset | 696.2
Belgium |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 1,320.4
Related tax asset | 330.1
Ireland |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 713.8
Related tax asset | 89.4
Luxembourg |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 586.4
Related tax asset | 159.4
France |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 533.3
Related tax asset | 137.8
Other |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforward | 416.8
Related tax asset | $ 18.0

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