Income Taxes (Table 5) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	$ 34,709.0
Related tax asset	6,598.0
Her Majesty's Revenue and Customs (HMRC) [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	2,563.4
Related tax asset	435.8
Her Majesty's Revenue and Customs (HMRC) [Member] | Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	20,335.9
Related tax asset	3,457.1
Tax and Customs Administration, Netherlands [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	4,108.7
Related tax asset	1,027.2
Federal Ministry of Finance, Germany [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	1,608.1
Related tax asset	259.5
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	1,268.0
Related tax asset	320.1
Luxembourg Inland Revenue [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	1,124.1
Related tax asset	292.4
Administration of the Treasury, Belgium [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	894.2
Related tax asset	303.9
Barbados Revenue Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	817.9
Related tax asset	52.4
Revenue Commissioners, Ireland [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	601.9
Related tax asset	75.2
Ministry of the Economy, Finance and Industry, France [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	505.4
Related tax asset	146.2
Tax Administration Jamaica [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	449.7
Related tax asset	149.9
Hungarian Income Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	166.8
Related tax asset	15.0
Other Income Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	264.9
Related tax asset	$ 63.3