Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 372.1	$ 331.7	$ 137.6
Additions based on tax positions related to the current year	6.8	90.6	13.3
Additions for tax positions of prior years	24.1	0.6	186.6
Reductions for tax positions of prior years	(136.8)	(34.1)	(3.0)
Reductions due to lapse of statute of limitations	(11.2)	(16.5)	(0.6)
Reductions due to settlements with tax authorities	(3.3)	(0.2)	(2.2)
Unrecognized tax benefits, ending balance	$ 251.7	$ 372.1	$ 331.7