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Accounting Policies (Details 5) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 26, 2011 Chief Executive Officer | Dec. 14, 2012 Chief Executive Officer | Dec. 31, 2012 Stock options | Dec. 31, 2011 Stock options | Dec. 31, 2010 Stock options | Dec. 31, 2012 Other stock-based plans | Dec. 31, 2011 Other stock-based plans | Dec. 31, 2010 Other stock-based plans
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation costs related to unvested stock-based compensation arrangements | $ 15.6 |  |  |  |  |  |  |  |  |  |
Total weighted average remaining term of unrecognized compensation costs | 2 years 7 months 6 days |  |  |  |  |  |  |  |  |  |
Compensation cost recognized in selling, general and administrative expenses | 5.8 | 5.3 | 4.7 |  |  |  |  |  |  |  |
Tax benefit recorded for the compensation expense |  |  |  |  |  | 0.7 | 0.7 | 0.7 | 1.4 | 1.5 | 1.2
Impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense (in dollars per share) | $ 0.10 | $ 0.09 | $ 0.08 |  |  |  |  |  |  |  |
Charges related to separation agreement with company's former CEO |  |  |  | 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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