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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