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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2015 Notes Narrative) (Details) - USD ($) $ in Millions | Sep. 15, 2015 | Sep. 30, 2010
--- | --- | ---
September 2015 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount |  | $ 200.0
Interest rate |  | 3.50%
Deferred financing costs |  | $ 6.8
Extinguishment of debt, cash paid | $ 48.2 |
Extinguishment of debt, amount | 22.4 |
2015 Notes Embedded Conversion Derivative [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, liability, fair value at issuance |  | $ 37.0
Derivative liability, cash paid to settle conversion premium | $ 25.8 |

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