Earnings Per Share Antidilutive Securities (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	784		1,707		784		1,707
Expense Related to Antidilutive Securities that Would Have Been Added Back to Income if Securities Were Dilutive	$ 0.2		$ 0.8		$ 0.4		$ 1.2
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	784	[1]	1,707	[1]	784	[1]	1,707	[1]

[1] (a) If the effect of the conversion of the trust preferred securities would have been dilutive, interest expense, net of tax, related to the convertible trust preferred securities of $0.2 million and $0.4 million for the three months ended September 30, 2012 and 2011, respectively, and of $0.8 million and $1.2 million for the nine months ended September 30, 2012 and 2011, respectively, would have been added back to net income/ (loss) attributable to common shareholders for diluted EPS computations for the periods presented.