Quarterly report pursuant to Section 13 or 15(d)

Capital Stock (Narrative) (Details)

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Capital Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2011
Jun. 13, 2011
May 17, 2011
Dec. 31, 2010
Mar. 31, 2010
Jun. 13, 2011
Common Stock [Member]
Jun. 13, 2011
Over-allotment Option [Member]
May 25, 2011
Preferred Class A [Member]
May 25, 2011
Preferred Class B [Member]
May 17, 2011
Maximum [Member]
Common Shares, Issued 149,195,469   149,195,469 10,350,000   138,845,469   9,000,000 1,350,000      
Price per share 85.63   85.63                  
Proceeds from Issuance of Common Stock $ 853.7   $ 853.7                  
Percentage increase in dividends payable     100.00%                  
Dividend payable, per share $ 0.28   $ 0.28     $ 0.0875 $ 0.14          
Common share dividends date paid Jun. 01, 2011 Mar. 01, 2011
Common share dividends date of record Apr. 29, 2011 Feb. 15, 2011
Common shares, authorized 400,000,000   400,000,000   224,000,000 224,000,000           400,000,000
Total shares, authorized         231,000,000             407,000,000
Preferred stock, shares included in amendment                   3,000,000 4,000,000