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Fair Value Of Financial Instruments (Schedule of Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (Unsecured Debt [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Carrying Amount [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior notes | $ 400.0 |
Carrying Amount [Member] | Senior Notes [Member] | 7.625% Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior notes |  | 150.0
Carrying Amount [Member] | Convertible Debt [Member] | 2009 Senior Convertible Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior convertible notes | 12.6 | 12.7
Carrying Amount [Member] | Convertible Debt [Member] | 2011 Senior Convertible Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior convertible notes | 198.3 | 193.0
Fair Value [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior notes | 380.0 |
Fair Value [Member] | Senior Notes [Member] | 7.625% Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior notes |  | 154.9
Fair Value [Member] | Convertible Debt [Member] | 2009 Senior Convertible Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior convertible notes | 26.6 | 21.0
Fair Value [Member] | Convertible Debt [Member] | 2011 Senior Convertible Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Non-Recurring Basis [Line Items] |  |
Senior convertible notes | $ 428.3 | $ 338.3

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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