Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	May 31, 2008	May 07, 2008	Sep. 30, 2011 Interest Expense [Member] Interest Rate Swaps [Member]	Sep. 30, 2011 Interest Expense [Member] Interest Rate Swaps [Member]	Dec. 31, 2010 Series 2005 - 1 Swap [Member]
Derivative [Line Items]
Net interest income (expense) recognized							$ (1.0)	$ 3.1
Floating interest rate base									3-month LIBOR
Interest rate swaps notional amount					150	150			300
Gain (loss) on foreign currency derivatives	$ (3.1)	$ 8.3	$ (0.6)	$ (1.7)