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Accounting Policies (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 26, 2011 Chief Executive Officer | Dec. 31, 2013 Chief Executive Officer | May 23, 2012 Chief Financial Officer | Dec. 31, 2013 Stock options | Dec. 31, 2012 Stock options | Dec. 31, 2011 Stock options | Dec. 31, 2013 Other stock-based plans | Dec. 31, 2012 Other stock-based plans | Dec. 31, 2011 Other stock-based plans
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |
Number of stock-based compensation plans | 2 |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation costs related to unvested stock-based compensation arrangements | $ 20.8 |  |  |  | $ 4.5 |  |  |  |  |  |  |
Total weighted average remaining term of unrecognized compensation costs | 2 years 6 months |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized in selling, general and administrative expenses | 9.6 | 5.8 | 5.3 |  |  |  |  |  |  |  |  |
Tax benefit recorded for the compensation expense |  |  |  |  |  |  | 1.2 | 0.7 | 0.7 | 1.9 | 1.4 | 1.5
Impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense (in dollars per share) | $ 0.14 | $ 0.10 | $ 0.09 |  |  |  |  |  |  |  |  |
Charges related to separation agreement with company's former executive |  |  |  | 6.3 |  | 1.5 |  |  |  |  |  |
Expected cash severance charge |  |  |  | 3.3 |  | 0.7 |  |  |  |  |  |
Expected non-cash severance charge |  |  |  | $ 3.0 |  | $ 0.8 |  |  |  |  |  |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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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