Income Taxes (Schedule of Components of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Domestic
Current	$ 71.8	$ 57.0	$ 42.9
Deferred	1,731.0	49.5	7.2
Total Domestic	1,802.8	106.5	50.1
Foreign
Current	158.2	74.7	107.5
Deferred	(2,186.5)	(16.6)	(53.1)
Total Foreign	(2,028.3)	58.1	54.4
Total
Current	230.0	131.7	150.4
Deferred	(455.5)	32.9	(45.9)
Income Tax Expense (Benefit)	$ (225.5)	$ 164.6	$ 104.5