Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines of Credit Payable (Lines of Credit Unused and Available) (Details)

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Unsecured Lines of Credit Payable (Lines of Credit Unused and Available) (Details) (USD $)
In Millions
6 Months Ended
Jun. 30, 2010
Jun. 30, 2011
Mar. 31, 2011
Credit Facility No. 1 [Member]
     
Credit facility, maturity June 2012    
Committed capacity   $ 75.0  
Borrowings outstanding   (74.0) 60.0
Letters of credit issued   (0.8)  
Unused and available   0.2  
Credit Facility No. 2 [Member]
     
Credit facility, maturity November 2011    
Committed capacity   262.0  
Borrowings outstanding   (171.0) 100.0
Letters of credit issued   (0.9)  
Unused and available   $ 90.1