FAIR VALUE OF FINANCIAL INSTRUMENTS - UNREALIZED GAINS AND LOSSES (DETAILS) (USD $) In Millions	9 Months Ended
Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains in AOCL	$ 13.4
Unrealized Losses - Less Than 12 Months	(3.0)
Unrealized Losses - Greater Than 12 Months	(4.0)
Unrealized Losses - Total Unrealized Losses	(7.0)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	3.7
Unrealized Losses - Net Unrealized Losses in AOCL	(3.3)
Net Unrealized Gains/(Losses) in AOCL	10.1
Fair Value of Securities with Unrealized Losses	350.4
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(3.3)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains in AOCL	4.8
Unrealized Losses - Less Than 12 Months	(0.2)
Unrealized Losses - Greater Than 12 Months	0
Unrealized Losses - Total Unrealized Losses	(0.2)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0
Unrealized Losses - Net Unrealized Losses in AOCL	(0.2)
Net Unrealized Gains/(Losses) in AOCL	4.6
Fair Value of Securities with Unrealized Losses	63.1
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains in AOCL	1.3
Unrealized Losses - Less Than 12 Months	(0.5)
Unrealized Losses - Greater Than 12 Months	(4.0)
Unrealized Losses - Total Unrealized Losses	(4.5)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	(3.7)
Unrealized Losses - Net Unrealized Losses in AOCL	(0.8)
Net Unrealized Gains/(Losses) in AOCL	0.5
Fair Value of Securities with Unrealized Losses	89.5
Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains in AOCL	7.3
Unrealized Losses - Less Than 12 Months	(2.3)
Unrealized Losses - Greater Than 12 Months	0
Unrealized Losses - Total Unrealized Losses	(2.3)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0
Unrealized Losses - Net Unrealized Losses in AOCL	(2.3)
Net Unrealized Gains/(Losses) in AOCL	5.0
Fair Value of Securities with Unrealized Losses	$ 197.8

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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