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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts [Roll Forward]
Balance at beginning of year	$ 3.6	$ 3.2
Provisions charged	0.5	0.4
Write-offs, net of recoveries	(0.1)	0
Balance at end of period	$ 4.0	$ 3.6

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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