Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines Of Credit Payable (Lines Of Credit Unused And Available) (Details)

v2.3.0.15
Unsecured Lines Of Credit Payable (Lines Of Credit Unused And Available) (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Credit Facility No. 1 [Member]
   
Line of Credit Facility [Line Items]    
Credit facility, maturity June 2012  
Committed capacity $ 75.0  
Borrowings outstanding (74.0) (74.0)
Letters of credit issued (0.8)  
Unused and available 0.2  
Credit Facility No. 2 [Member]
   
Line of Credit Facility [Line Items]    
Credit facility, maturity July 2014  
Committed capacity 400.0  
Borrowings outstanding (119.0) (171.0)
Letters of credit issued (0.9)  
Unused and available $ 280.1