Income Taxes (Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Provisions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance as of December 31	$ 115.4	$ 180.8
UTPs [Member]
Balance as of January 1	180.8	164.2	185.1
Additions for tax positions related to the current year	48.9	31.1	31.1
Additions for tax positions of prior years	15.3	16.2	52.5
Reductions for tax positions of prior years	(27.3)	(9.9)	(47.0)
Settlements with taxing authorities	(2.1)		(50.7)
Lapse of statute of limitations	(10.2)	(20.8)	(6.8)
Balance as of December 31	$ 205.4	$ 180.8	$ 164.2