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Subsequent Events Subsequent Event (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 18, 2014 | Mar. 07, 2013 | Sep. 30, 2014 Tender Offer [Member] | Sep. 30, 2013 Tender Offer [Member] | Oct. 20, 2014 Tender Offer [Member] Subsequent Event [Member] | Sep. 19, 2014 Tender Offer [Member] Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in number of shares authorized for repurchase |  |  |  |  | 995,698 | 1,000,000 |  |  |  |  | 995,698
Stock Repurchased During Period, Value Per Share |  |  |  |  |  |  |  |  |  | $ 126 |
Common stock repurchased, shares | 0 | 282,018 | 1,691,046 | 1,145,701 |  |  | 1,553,170 |  | 0 | 995,698 |
Common stock repurchased, value | $ 0 | $ 31.3 | $ 218.7 | $ 127.2 |  |  | $ 200.3 | [1] | $ 0 | $ 125.0 |
[1] | Tender Offer Cost amount includes offering costs of $0.3 million for the nine months ended September 30, 2014.

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- Definition Stock Repurchased During Period, Cost Per Share + References No definition available. + Details
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- Definition Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Increase + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Details
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