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TREASURY STOCK PURCHASE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Oct. 31, 2011 2011 Repurchase Plan | Mar. 31, 2010 2010 Repurchase Plan | Dec. 31, 2011 2010 Repurchase Plan
TREASURY STOCK PURCHASE |  |  |
Amount of common stock the board of directors authorized to repurchase | $ 250.0 | $ 200.0 |
Common stock repurchased (in shares) |  |  | 5.0
Average purchase price (in dollars per share) |  |  | $ 35.63
Common stock repurchased |  |  | $ 176.4

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: 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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