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Condensed Consolidated Statement of Equity (Parenthetical) (Additional Paid-in Capital, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Deferred tax adjustment
 
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature $ 8.2
Issuance cost on convertible debt
 
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature $ 0.5