Equity (Details 2) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Reconciliation of the beginning and ending balances of equity derivative instruments
Balance of Level 3 at December 31, 2010	$ 96.2
Unrealized gain	(21.9)
Transfer out of liability to paid in capital	(74.3)
Balance of Level 3 at June 30, 2011	$ 0

Fair value measurements with unobservable inputs reconciliation recurring basis liability value.

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- Definition

Reconciliation of the beginning and ending balances of equity derivative instruments.

+ Details

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)

+ Details

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- Definition

This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(3)

+ Details

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