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Notes Payable (2029 Notes Narrative) (Details) (December 2029 Notes [Member], USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2014
Apr. 25, 2014
Subsequent Event [Member]
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 5.25%  
Interest rate, effective percentage 11.90%  
Debt instrument, convertible, conversion price per share $ 9.57  
Extinguishment of debt, amount $ 31.3 $ 1.9
Extinguishment of debt, cash paid 54.6 4.5
Extinguishment of debt, cash paid for shares of common stock 23.2  
Extinguishment of debt, shares issued 946,793  
Extinguishment of debt, carrying value at extinguishment 29.9 1.8
Extinguishment of debt, gain (loss), net of tax $ (2.3) $ (0.1)