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Debt (Details) - Senior Subordinated Convertible Notes [Member]
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
shares
NotesConverted
$ / shares
Debt Instrument [Line Items]  
Stated Interest Rate Percentage - Debt Instruments (in hundredths) 3.75%
Maturity year of Senior subordinated convertible notes 2034
First Conversion Date Jan. 15, 2009
Number of Notes Converted | NotesConverted 8,066
Cash Payments for Debt Conversions (in millions) $ 17.1
Deferred Tax Liability (in millions) $ 0.9
Per Note Conversion Price (in dollars per share) | $ / shares $ 506.85
Principal note amount (in millions) $ 4.0
Excess above Principal Note Amount (in millions) $ 12.0
If converted, issuance of common stock shares (in shares) | shares 76,838