Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2009	Sep. 30, 2012
Common and preferred stock
Proceeds from the Treasury	$ 73.0
Unpaid and deferred dividends		8.1
Series B Preferred Stock
Common and preferred stock
Cumulative dividends, initial rate for the first five years (as a percent)		5.00%
Cumulative dividends rate, thereafter (as a percent)		9.00%
Period for payment of cumulative dividends using the initial cumulative dividend rate		5 years
Fair value, preferred stock	68.2
Unpaid and deferred dividends		8.1
Warrants
Common and 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, preferred stock	$ 4.8