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Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2013
Oct. 31, 2013
Subsequent Event
Oct. 08, 2013
Subsequent Event
Unsecured Debt
Oct. 08, 2013
Subsequent Event
Line of Credit
Revolving Credit Facility
Subsequent Event [Line Items]        
Debt instrument, face amount     $ 125.0  
Debt instrument, interest rate, stated percentage     3.75%  
Line of credit facility, current borrowing capacity       $ 140.0
Stock repurchase program, additional number of shares authorized to be repurchased   10,955,345    
Stock repurchase program, number of shares authorized to be repurchased 4,044,655 15,000,000