Valuation And Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Valuation And Qualifying Accounts [Abstract]

Summary Of Allowance For Doubtful Accounts

Year end	Balance at beginning of Year		Provision for doubtful accounts (1)		Write-offs			Acquired through acquisitions		Balance at end of Year
2011	$	21.0	$	13.7	$	(17.3	)	$	—	$	17.4
2010		26.4		19.2		(24.6	)		—		21.0
2009		27.1		20.2		(21.1	)		0.2		26.4

(1) Includes $0.2 million, $0.5 million and $0.5 million from discontinued operations for the years ended December 31, 2011, 2010 and 2009, respectively.

Summary Of Estimated Revenue Adjustments

Year end	Balance at beginning of Year		Provision for estimated revenue adjustments (1)		Write-offs			Acquired through acquisitions		Balance at end of Year
2011	$	6.5	$	12.1	$	(11.8	)	$	—	$	6.8
2010		8.7		7.0		(9.2	)		—		6.5
2009		7.2		8.8		(7.3	)		—		8.7

(1) Includes $0.3 million, $0.5 million and $0.2 million from discontinued operations for the years ended December 31, 2011, 2010 and 2009, respectively.