Income Taxes (Reconciliation of Federal to Effective Taxes) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accrued Income Taxes [Abstract]
Computed “expected” tax benefit (expense)	$ (60.4)	$ 218.7	$ (2,533.3)	$ 143.3
Non-taxable gain associated with the U.K. JV Transaction	(66.0)	0.0	2,050.2	0.0
Non-deductible or non-taxable foreign currency exchange results	88.9	(224.3)	169.7	(166.6)
Change in valuation allowances	(19.1)	(98.6)	(107.6)	(198.2)
International rate differences	(39.5)	(3.0)	(81.1)	(6.7)
Basis and other differences in the treatment of items associated with investments in subsidiaries and affiliates	99.3	(7.4)	75.1	(24.6)
Non-deductible or non-taxable interest and other items	(12.3)	26.4	(50.7)	(19.7)
Recognition of previously unrecognized tax benefits	0.0	0.0	20.5	188.8
Tax benefit associated with technology innovation	5.7	4.9	17.2	54.4
Enacted tax law and rate changes (e)	2.5	242.3	2.1	274.0
Other, net	(1.3)	6.5	(6.3)	7.5
Total income tax benefit (expense)	$ (2.2)	$ 165.5	$ (444.2)	$ 252.2