VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2014

Valuation And Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

12. 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
	2014	$	14.2	$	16.4	$	(16.3)	$	14.3
	2013		21.0		16.4		(23.2)		14.2
	2012		17.4		21.7		(18.1)		21.0
	(1) Includes $0.1 million, $0.6 million and $0.7 million from discontinued operations for the years ended December 31, 2014, 2013 and 2012, respectively.
Estimated Revenue Adjustments
	Year end	Balance at Beginning of Year		Provision for Estimated Revenue Adjustments (1)		Write-Offs		Balance at End of Year
	2014	$	3.9	$	5.1	$	(5.9)	$	3.1
	2013		6.4		9.4		(11.9)		3.9
	2012		6.8		10.6		(11.0)		6.4
	(1) Includes $0.1 million, $0.4 million and $0.7 million from discontinued operations for the years ended December 31, 2014, 2013 and 2012, respectively.