Equity (Details 1) (Warrant [Member], Loss on Equity Derivative Instrument [Member], USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Warrant [Member] \| Loss on Equity Derivative Instrument [Member]
Company's derivative instruments on net loss
Gain (loss) on equity derivative instruments	$ 0	$ 21.5	$ 21.9	$ (3.3)

Net gain (loss) included in earnings for the period from the net change in fair value of derivative instrument not designated as hedging instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(1)(b)

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration