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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Series B Preferred Stock [Member]
Jun. 30, 2011
Series C Preferred Stock [Member]
SUPPLEMENTAL CASH FLOWS DISCLOSURE:    
Conversion of convertible preferred stock amount converted 15.0 50.0