General Accounting Matters (Tables)

6 Months Ended

Jun. 30, 2011

General Accounting Matters [Abstract]

Allowance for Doubtful Accounts

The following table presents the activity of our allowance for doubtful accounts for the periods presented:

	For the Six Months
	Ended June 30,
	2011			2010
Balance at beginning of period	$	18.4		$	16.8
Charged to costs and expenses		0.6			0.7
Deductions (1)		(5.2	)		--
Balance at end of period	$	13.8		$	17.5
(1)   Primarily due to our reassessment of the allowance for doubtful accounts as a result of improved credit ratings of a significant customer, which reduced our exposure to potential uncollectibility.