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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Oct. 28, 2013
Sep. 30, 2013
Sep. 30, 2013
Aug. 06, 2013
Oct. 28, 2013
Series B [Member]
Mar. 31, 2013
Series B [Member]
Sep. 30, 2013
Series B [Member]
Feb. 12, 2013
Series B [Member]
Mar. 11, 2013
Series A [Member]
Sep. 30, 2013
Series A [Member]
Class of Stock [Line Items]                    
Public offering, shares               2,000,000    
Dividend rate percentage             7.25%     8.875%
Public offering, per share               $ 24.58    
Public offering, realized net proceeds, net offering expenses               $ 47.6    
Additional shares issued to underwriters               300,000    
Net proceeds realized from issuance of additional shares to underwriters               7.1    
ATM equity program, shares issued           221,000        
ATM equity program, weighted average price per share           $ 24.52        
ATM equity program, realized net proceeds, net offering expenses           5.2        
At market continuous offering program, shares authorized       10,000,000            
At market continuous offering program, shares sold   0                
Shares of Redeemable Preferred Stock redeemed and purchased                 1,408,000  
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased                 $ 35.4  
Common stock, dividends declared $ 0.05                  
Preferred stock, dividends declared         $ 0.453125          
Dividends payable, date declared     Oct. 28, 2013              
Dividends payable, date of record     Nov. 08, 2013              
Dividends payable, date to be paid     Nov. 20, 2013