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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2009
Dec. 31, 2015
Preferred Stock    
Proceeds from the Treasury $ 73.0  
Series B Stock    
Preferred Stock    
Period for payment of cumulative dividends using the initial cumulative dividend rate   5 years
Cumulative dividends, initial rate for the first five years (as a percent)   5.00%
Cumulative dividends rate (as a percent)   9.00%
Fair value 68.2  
Warrants    
Preferred Stock    
Warrants, term   10 years
Warrants to purchase the Company's common stock, initially authorized (in shares)   815,339
Warrants, exercise price (in dollars per share)   $ 13.43
Fair value $ 4.8