Income Taxes (Reconciliation of Federal to Effective Taxes) (Schedule) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed “expected” tax benefit (expense)	$ 875.2	$ (270.6)	$ (2,660.2)
Change in valuation allowances	(275.1)	(39.0)	(62.2)
Non-deductible or non-taxable foreign exchange results	(198.7)	267.3	218.0
Non-deductible or non-taxable interest and other expenses	(138.4)	(89.6)	(69.0)
Basis and other differences in the treatment of items associated with investments in subsidiaries and affiliates	(406.9)	(68.4)	84.0
International rate differences	(13.3)	(147.1)	(92.4)
Tax benefit associated with technology innovation	6.5	22.1	25.8
Non-taxable gain on the U.K. JV Transaction	0.0	0.0	2,066.0
Recognition of previously unrecognized tax benefits	0.0	0.0	20.5
Other, net	1.1	6.4	(3.8)
Total income tax expense	$ (149.6)	$ (318.9)	$ (473.3)