Earnings Per Share - Additional Information (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Common Stock Equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculations of earnings per share as the effect of including them would have been anti-dilutive	0.1	1.6	0.4	1.1
Antidilutive Securities Due To Effect On Period Loss [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculations of earnings per share as the effect of including them would have been anti-dilutive	1.7		1.6
Series A Preferred Stock | Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculations of earnings per share as the effect of including them would have been anti-dilutive	7.3		16.3
Series B Preferred Stock | Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculations of earnings per share as the effect of including them would have been anti-dilutive	38.8		42.1