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Notes Payable (2029 Notes Narrative) (Details) (December 2029 Notes [Member], USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
December 2029 Notes [Member]
 
Debt Instrument [Line Items]  
Debt instrument, interest rate, stated percentage 5.25%
Debt instrument, convertible, conversion price per share $ 9.57
Extinguishment of debt, amount $ 36.2
Extinguishment of debt, cash paid 66.8
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 34.6
Extinguishment of debt, loss, net of tax $ (2.5)