Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) (Parentheticals)

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) (Parentheticals) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Issued During Period, Shares, Other     9,734,876
Stock Issued During Period, Shares, New Issues 4,600,000    
Subsidiaries [Member]
      
Common units issued upon exercise of options 9,000 32,000 46,000
Restricted units granted net of forfeitures 79,350 78,180 100,050
Common units issued net of reacquired equity     2,433,719
Units Issued 1,200,000   1,700,000
Preferred distributions 0.00 2.07 1.88
Payments of Stock Issuance Costs $ 0.7   $ 5.7
Partners' Capital Account, Units, Converted 160,332    
Common distributions 3.175 3.090 3.060
Preferred units redemption   3,000,000  
Parent Company [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 36,500 129,100 184,170
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 317,400 312,720 400,200
Payments of Stock Issuance Costs $ 0.7   $ 5.7
Stock Issued During Period, Shares, Conversion of Convertible Securities 136,360    
Number of Operating Partnership Units Exchanged for Company Common Shares 160,332    
Partners' Capital Account, Units, Converted 641,328    
Preferred dividends per share $ 0.00 $ 2.07 $ 1.88
Common Stock, Dividends, Per Share, Cash Paid $ 0.7938 $ 0.7725 $ 0.7638
Common Shares [Member] | Parent Company [Member]
      
Stock Issued During Period, Shares, New Issues 4,600,000   6,900,000