Other Capital Stock Agreements (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Oct. 31, 2012	Mar. 31, 2010
Schedule of Capitalization, Equity [Line Items]
Stock Issued During Period, Shares, New Issues	17,500,000	161,770,206
Offering Price Per Share	$ 2.25	$ 1.15
Net Proceeds From Stock Offering	$ 37.1	$ 181.5
Payments of Underwriting Discounts and Commissions	2.0	4.3
Payments of Stock Issuance Costs	$ 0.2	$ 0.3
Stock Issued During Period to Invus, Shares	3,000,000	94,270,206