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Stock Repurchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2014
Stock Repurchase Plan [Abstract] |
Schedule of stock repurchase activity |
|  |  |  | Number of shares repurchased |  | Average price paid per share |  | Amount available for future repurchases (in millions)
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2012 |  |  |  |  | 484,841 |  |  | $ | 51.56 |  |  | $ | 95.0 |
2013 |  |  |  |  | 495,085 |  |  | $ | 50.49 |  |  | $ | 70.0 |
2014 |  |  |  |  | — |  |  | $ | — |  |  | $ | 70.0 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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