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Stock-Based Compensation Outstanding Options and SSARs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | $ 200,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |  |  |
Beginning balance |  | 7,004 | 6,937 | 8,475 |
Options / SSARs granted |  | 378 | 494 | 343 |
Options / SSARs exercised |  | (1,334) | (43) | (1,861) |
Options / SSARs cancelled |  | (309) | (384) | (20) |
Ending balance |  | 5,739 | 7,004 | 6,937 |
Options / SSARs outstanding Weighted Average Exercise Price |  | $ 14.54 | $ 14.19 | $ 14.26 | $ 12.88
SSARs granted Weighted Average Exercise Price |  | 17.04 | 18.09 | 20.49 |
Options / SSARs exercised Weighted Average Exercise Price |  | 10.76 | 9.92 | 9.06 |
Options / SSARs cancelled Weighted Average Exercise Price |  | $ 25.83 | $ 21.14 | $ 22.23 |
Options / SSARs outstanding Weighted Average Contractual Term (in years) |  | 4 years 2 months 12 days |  |  |
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) |  | $ 29.8 |  |  |
Vested and expected to vest | [1] | 5,714 |  |  |
Vested and expected to vest Aggregate Intrinsic Value (in millions) | [1] | $ 29.8 |  |  |
Options / SSARs exercisable |  | 4,987 |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Exercise Price |  | $ 14.04 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term |  | 3 years 6 months 22 days |  |  |
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) |  | $ 29.5 |  |  |
Allocated Share-based Compensation Expense |  | $ 0.5 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |  |  |
Weighted-average period of years costs are expected to be recognied over |  | 1 year 2 months 12 days |  |  |
Allocated Share-based Compensation Expense |  | $ 3.5 | $ 3.0 | $ 2.7 |
Unrecognized compensation costs |  | 4.2 |  |  |
Options and Ssars [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |  |  |
Allocated Share-based Compensation Expense |  | 3.6 | $ 3.8 | $ 3.4 |
Unrecognized compensation costs |  | $ 3.7 |  |  |
Shares available under stock award plans |  | 4,200 |  |  |
Options and Ssars [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |  |  |
Weighted-average period of years costs are expected to be recognied over |  | 1 year 3 months 7 days |  |  |
[1] | Options or SSARS expected to vest based upon historical forfeiture rate

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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