Income Taxes (Reconciliation of Federal to Effective Taxes) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed “expected” tax benefit (expense)		$ (2,660.2)	$ 342.2	$ 236.0
Non-taxable gain associated with the U.K. JV Transaction		2,066.0	0.0	0.0
Non-deductible or non-taxable foreign currency exchange results		218.0	(395.1)	(26.5)
International rate differences		(92.4)	6.7	8.5
Basis and other differences in the treatment of items associated with investments in subsidiaries and affiliates		84.0	(245.8)	(165.0)
Non-deductible or non-taxable interest and other expenses		(69.0)	(25.1)	(191.9)
Change in valuation allowances		(62.2)	(8.4)	(113.6)
Tax benefit associated with technology innovation		25.8	62.2	0.0
Recognition of previously unrecognized tax benefits		20.5	285.8	5.9
Enacted tax law and rate changes		2.2	248.2	19.2
Other, net		(6.0)	5.2	(6.6)
Income tax benefit (expense)	$ 275.9	$ (473.3)	$ 275.9	$ (234.0)