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Senior Notes (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended
--- | --- | ---
Sep. 30, 2012 2042 senior notes | Oct. 31, 2012 2022 Senior Notes
Senior Notes |  |
Issuance of debt | $ 200.0 | $ 140.0
Interest rate (as a percent) | 6.375% | 5.25%

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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