Income Taxes (Tax Loss Carryforwards and Related Tax Assets) (Details) - Capital Loss Carryforward $ in Millions	Dec. 31, 2021 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	$ 6,096.6
Related tax asset	1,482.5
The Netherlands
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	2,747.2
Related tax asset	708.8
Belgium
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	1,205.5
Related tax asset	301.4
Luxembourg
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	933.0
Related tax asset	243.4
U.K.
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	601.6
Related tax asset	150.4
Ireland
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	597.5
Related tax asset	75.0
Other
Operating Loss Carryforwards [Line Items]
Tax loss carryforward	11.8
Related tax asset	$ 3.5