NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS (DETAILS) (USD $) In Millions, unless otherwise specified	6 Months Ended					6 Months Ended				6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Convertible Subordinated Debt [Member]	Dec. 31, 2011 Convertible Subordinated Debt [Member]	Jun. 30, 2012 Senior Secured Credit Agreement	Dec. 31, 2011 Senior Secured Credit Agreement	Jun. 30, 2012 Senior Secured Credit Agreement Minimum [Member]	Jun. 30, 2012 Senior Secured Credit Agreement Maximum [Member]	Jun. 30, 2012 Senior Secured Notes 9 Percent [Member]	Dec. 31, 2011 Senior Secured Notes 9 Percent [Member]	Dec. 21, 2010 Senior Secured Notes 9 Percent [Member]	Jun. 30, 2012 Other Notes Payable [Member]	Dec. 31, 2011 Other Notes Payable [Member]	Jun. 30, 2012 Common Stock Including Additional Paid in Capital [Member]	Jun. 30, 2011 Common Stock Including Additional Paid in Capital [Member]
Debt Instruments [Abstract]
Direct corporate obligations	$ 778.2		$ 857.9	$ 293.0	$ 293.0	$ 223.8	$ 255.2			$ 275.0	$ 275.0		$ 0	$ 50.0
Unamortized Discount				(11.9)	(12.9)	(1.7)	(2.4)
Ceiling on Investments in Capital Stock at Period Start	1.00%
Ceiling on Investments in Capital Stock at Period End	3.00%
Mandatory Debt Repayment						31.4
Cost of shares acquired	58.2	16.2													58.2	16.2
Dividends, Common Stock	4.7														0
Loss on Extinguishment of Debt Resulting from Required Prepayments						0.7
Early Payment of Long Term Note Payable	81.4	66.2											50.0
Debt to Capitalization Ratio Required									30.00%
Debt to Capitalization Ratio at Period End						15.70%
Interest Coverage Ratio Required								2	1
Interest Coverage Ratio at Period End						5.24		5.13	1
Aggregate Adjusted Capital to Company Action Level Risk-Based Capital Ratio, After Stated Date								250.00%
Aggregate Adjusted Capital to Company Action Level Risk-Based Capital Ratio, Prior to Stated Date								250.00%
Aggregate Adjusted Capital to Company Action Level Risk Based Capital Ratio at Period End						369.00%
Minimum Combined Statutory Capital and Surplus								1,200.0
Combined Statutory Capital and Surplus at Period End						1,832.1
Long-term Debt, Fiscal Year Maturity [Abstract]
2013	47.5
2014	65.0
2015	80.0
2016	31.3
2017	293.0
Thereafter	275.0
Long-term Debt	791.8
Prepayment of Debt, Minimum Increment Amounts or Multiples Of						1.0
Prepayment of Debt, Mandatory Percent of Cash Proceeds from Asset Sales and Casualty Events						100.00%
Prepayment of Debt, Mandatory Percent of Cash Proceeds from Debt Issuances						100.00%
Prepayment of Debt, Mandatory Percent of Cash Proceeds from Equity Issuances						50.00%
Prepayment of Debt, Mandatory Percent of Restricted Payments						100.00%
Debt to Capitalization Ratio, Threshold Requiring Equal Debt Repayment						17.50%
Debt to Capitalization Ratio, Minimum Threshold Requiring Half Debt Repayment						12.50%
Debt to Capitalization Ratio, Maximum Threshold for Repayment Requirement						12.50%
Debt to Capitalization Ratio, No Manadatory Prepayments, Minimum Required						20.00%
Debenture Interest Rate	7.00%			7.00%								9.00%
Minimum Pro Forma Risk-Based Capital Ratio for Restricted Payments										225.00%
Restricted Payments Include Items in Excess of Threshold, Amount										75
Restricted Payments, Percent of Net Income, Maximum										50.00%
Limit of Restricted Payments Permitted, Percent of Consolidated Net Income										50.00%
Remaining Amount of Restricted Payments Eligible to be Paid										$ 122