PREFERRED SECURITIES OF SUBSIDIARIES, Narrative (Details) (Tornado Finance V.O.F. [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended
	Jul. 09, 2009	Jul. 31, 1999
Tornado Finance V.O.F. [Member]
Preferred Securities of Subsidiaries [Line Items]
Preferred partnership units issued		$ 500
Preferred stock dividend rate		7.965%
Redemption amount of preferred partnership units	$ 520