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Common Shares (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 57 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended 1 Months Ended
Jan. 31, 2008
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Mar. 31, 2010
2010 ATM Program [Member]
Dec. 31, 2011
2010 ATM Program [Member]
Dec. 31, 2010
2010 ATM Program [Member]
Jan. 31, 2012
2011 ATM Program [Member]
May 31, 2011
2011 ATM Program [Member]
Feb. 17, 2012
2011 ATM Program [Member]
Dec. 31, 2011
2011 ATM Program [Member]
Jan. 31, 2012
Issuance of Equity [Member]
Activity Under Share Offering Program [Line Items]                          
Shares repurchase program, authorized amount $ 500,000,000                        
Stock repurchased during period, shares         4,300,000                
Stock repurchased during period, value       (6,000) 230,200,000                
Remaining dollar value of securities authorized to be repurchased   269,800,000                      
Maximum aggregate offering price of common shares           250,000,000       300,000,000      
Common shares sold             252,500 4,867,700 100,000   0 1,498,500 6,612,500
Average price per share             $ 55.81 $ 48.37 $ 62.41   $ 0.00 $ 62.98  
Total net consideration   106,571,000 231,651,000 272,112,000     13,847,000 231,650,500 3,200,000   0 92,723,600 391,600,000
Maximum aggregate offering price of remaining common shares available for sale                       $ 202,400,000  
Number of common and preferred stock authorized to issue   110,000,000     110,000,000                
Common shares, authorized   100,000,000 100,000,000   100,000,000                
Preferred shares, authorized   10,000,000     10,000,000                
Common shares, outstanding   72,000,000     72,000,000                
Preferred shares, outstanding   0     0                
Common shares available for sale   100,000,000 100,000,000   100,000,000                
Equity method investment ownership percentage   80.00%     80.00%