Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity At-the-Market Offering (Details)

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Stockholders' Equity At-the-Market Offering (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jul. 18, 2012
Class of Stock [Line Items]    
At-the-Market Offering, Number of Shares Authorized to be Sold 20,000,000  
Stock Sold, Shares, At-the-Market Offering 7,600,000  
Stock Sold, Value, At-the-Market Offering $ 77.6  
Stock Issued And Outstanding, Shares, At-the-Market Offering 5,400,000 (2,200,000)
Stock Issued and Outstanding, Value, At-the-Market Offering $ 55.4 $ (22.2)