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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jul. 26, 2013
Jul. 26, 2013
Series B [Member]
Mar. 31, 2013
Series B [Member]
Jun. 30, 2013
Series B [Member]
Feb. 12, 2013
Series B [Member]
Mar. 11, 2013
Series A [Member]
Jun. 30, 2013
Series A [Member]
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        
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