VALUATION AND QUALIFYING ACCOUNTS (Tables)

12 Months Ended

Dec. 31, 2013

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

13. VALUATION AND QUALIFYING ACCOUNTS
The following table summarizes the activity and ending balances in our allowance for doubtful accounts and estimated revenue adjustments (amounts in millions):
Allowance for Doubtful Accounts
	Year end	Balance at Beginning of Year		Provision for Doubtful Accounts (1)		Write-Offs		Balance at End of Year
	2013	$	21.0	$	16.4	$	(23.2)	$	14.2
	2012		17.4		21.7		(18.1)		21.0
	2011		21.0		13.7		(17.3)		17.4
	(1) Includes $0.6 million, $0.7 million and $1.1 million from discontinued operations for the years ended December 31, 2013, 2012 and 2011, respectively.
Estimated Revenue Adjustments
	Year end	Balance at Beginning of Year		Provision for Estimated Revenue Adjustments (1)		Write-Offs		Balance at End of Year
	2013	$	6.4	$	9.4	$	(11.9)	$	3.9
	2012		6.8		10.6		(11.0)		6.4
	2011		6.5		12.1		(11.8)		6.8
	(1) Includes $0.4 million, $0.7 million and $1.2 million from discontinued operations for the years ended December 31, 2013, 2012 and 2011, respectively.