Income Taxes (Schedule of Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current tax expense (benefit)	$ 551.9	$ 308.1	$ 358.7
Deferred tax expense (benefit)	(53.5)	67.8	(25.2)
Benefit (provision) for income taxes	(498.4)	(375.9)	(333.5)
United States [Member]
Current tax expense (benefit)	377.6	180.4	247.0
Deferred tax expense (benefit)	(18.8)	66.5	(42.5)
Benefit (provision) for income taxes	(358.8)	(246.9)	(204.5)
Non-U.S. [Member]
Current tax expense (benefit)	174.3	127.7	111.7
Deferred tax expense (benefit)	(34.7)	1.3	17.3
Benefit (provision) for income taxes	$ (139.6)	$ (129.0)	$ (129.0)