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Subsequent Event Debt Issuance (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 Senior Notes [Member] | Jun. 30, 2013 Convertible Debt Issued in 2004 [Member] | Jun. 30, 2013 Convertible Debt Issued in 2010 [Member] | Jul. 16, 2013 Issuance of Debt [Member] Senior Notes [Member]
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Subsequent Event [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage | 6.625% | 5.25% | 3.50% |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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