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Treasury Stock (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |
Treasury stock purchase plan | $ 40.0 |
Treasury stock purchase plan remaining available | $ 22.5 |
Stock Repurchased and Retired During Period, Shares |  | 5,600,000
Shares Paid for Tax Withholding for Share Based Compensation | 17,299 | 4,232
Payments Related to Tax Withholding for Share-based Compensation | $ 1.5 | $ 0.2
Shares withheld for option exercise in lieu of cash payment | 823 | 4,583
Value of option exercises with shares remitted to the company in lieu of cash payment | $ 0.1 | $ 0.3

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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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