NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS (LOSS ON EXTINGUISHMENT OF DEBT) (NARRATIVE) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 28, 2012
Debt Instrument [Line Items]
Loss on extinguishment or modification of debt	$ 0.0	$ (32.8)	$ (0.6)
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Loss on extinguishment or modification of debt			$ (0.2)
Senior Debentures 7 Percent [Member]
Debt Instrument [Line Items]
Interest rate			7.00%
Repurchase of remaining principal amount			$ 3.5
Secured Debt [Member] | Senior Secured Credit Agreement [Member]
Debt Instrument [Line Items]
Loss on extinguishment or modification of debt			$ (0.4)
Senior Notes [Member] | Senior Secured Note 6.375 Percent [Member]
Debt Instrument [Line Items]
Interest rate				6.375%