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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Common shares, par value $ 0.10 $ 0.10
Common shares, shares authorized 500,000,000 500,000,000
Common shares, shares issued 317,465,639 315,239,299
Treasury at cost 799,678 977,673
Class H preferred shares [Member]
    
Cumulative redeemable preferred shares, liquidation value $ 500 $ 500
Cumulative redeemable preferred shares, shares authorized 750,000 750,000
Cumulative redeemable preferred shares, shares issued 410,000 410,000
Cumulative redeemable preferred shares, shares outstanding 410,000 410,000
Preferred stock dividend rate 7.375% 7.375%
Cumulative redeemable preferred shares, par value      
Class J preferred shares [Member]
    
Cumulative redeemable preferred shares, liquidation value $ 500 $ 500
Cumulative redeemable preferred shares, shares authorized 750,000 750,000
Cumulative redeemable preferred shares, shares issued 400,000 400,000
Cumulative redeemable preferred shares, shares outstanding 400,000 400,000
Preferred stock dividend rate 6.50% 6.50%
Cumulative redeemable preferred shares, par value