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Indebtedness (Interest Expense Recognized On Convertible Senior Subordinated Notes) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 |  |  |
Interest expense | $ 0 | $ 0 | $ 0.9
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036 |  |  |
Interest expense | $ 11.7 | $ 11.2 | $ 10.7

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration