Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Unrecognized tax benefits, beginning balance	$ 84.3	$ 113.4	$ 104.3
Additions based on tax positions related to the current year	1.2	7.5	16.8
Additions for tax positions of prior years	9.3	6.4	9.7
Reductions for tax positions of prior years	(20.0)	(14.4)	(5.8)
Reductions due to lapse of statute of limitations	(6.7)	(5.3)	(2.9)
Reductions due to settlements with tax authorities	(32.1)	(23.3)	(8.7)
Unrecognized tax benefits, ending balance	$ 36.0	$ 84.3	$ 113.4