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Stock Transactions Stock Transactions (Narrative) (Details) (USD $) | 9 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended
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Sep. 30, 2013 | Jan. 24, 2013 January 2013 Share Repurchase Authorization [Member] | Apr. 18, 2013 April 2013 Share Repurchase Authorization [Member] | Apr. 30, 2013 April 2013 Share Repurchase Authorization [Member] | Sep. 30, 2013 July 2013 Share Repurchase Authorization | Jul. 18, 2013 Subsequent Event | Jul. 18, 2013 Subsequent Event July 2013 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 815,011 |  | 2,865,132 | 471,169 |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 47,600,000 |  | $ 182,900,000 | $ 30,800,000 |  |
Stock Repurchase Program, Authorized Amount |  | 200,000,000.0 | 100,000,000 |  |  | 400,000,000 | 100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 138,700,000 |  |  |  |  |  |

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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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