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Income Taxes (Tax Loss Carryforwards and Related Tax Assets) (Details) $ in Millions	Dec. 31, 2019 USD ($)
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

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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