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Notes Payable (2015 Notes Narrative) (Details) (September 2015 Notes [Member], USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
September 2015 Notes [Member]
 
Debt Instrument [Line Items]  
Extinguishment of debt, amount $ 46.5
Extinguishment of debt, cash paid 52.9
Extinguishment of debt, cash paid for shares of common stock 33.1
Extinguishment of debt, shares issued 1,496,664
Extinguishment of debt, carrying value at extinguishment 43.8
Extinguishment of debt, loss, net of tax $ (5.4)