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Consolidated Statements of Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dividends declared, per common share and common unit $ 1.4 $ 1.4 $ 1.4
3.25% Exchangeable Notes [Member] | Exchangeable Notes [Member]
     
Stated interest rate     3.25%