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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Number of Shares Used to Compute Basic and Diluted Earnings Per Share |
The denominator used to compute basic and diluted earnings per share is as follows (in millions):
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Denominator for basic EPS – weighted average shares |  |  | 41.7 |  |  |  | 41.2 |  |  |  | 41.6 |  |  |  | 41.1 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee/director stock options and restricted stock units |  |  | 0.5 |  |  |  | 0.2 |  |  |  | 0.4 |  |  |  | 0.3 |
Denominator for diluted EPS – weighted average shares |  |  | 42.2 |  |  |  | 41.4 |  |  |  | 42.0 |  |  |  | 41.4 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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