Indebtedness (Summary Of Components Of Interest As Presented In Consolidated Statements Of Operations) (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Indebtedness [Abstract]
Expense on borrowings	$ (16.2)		$ (14.0)		$ (48.9)		$ (35.4)
Income	1.6		0.8		3.9		1.9
Income/(expense) on UTBs and other tax related liabilities	0.9		(0.2)		(6.1)		(5.3)
Capitalized	0.8		0.6		2.2		1.2
Legacy Tax		[1]		[1]	3.7	[1]	2.5	[1]
Total interest expense, net	(12.9)		(12.8)		(45.2)		(35.1)
Reversal of accrued interest expense	2.8				2.8
Interest income	$ 0.9				$ 0.9

[1] The 2011 amount represents a reversal of $2.8 million of accrued interest expense relating to the favorable resolution of a Legacy Tax Matter and $0.9 million of interest income related to a tax year prior to the 2000 Distribution. The 2010 amount represents interest income related to the favorable settlement of Legacy Tax Matters.