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Net Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
Net Earnings Per Share [Abstract] |
Net Earnings Per Share | The calculation of Net earnings per share - basic and Net earnings per share - diluted was as follows:
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net earnings per share - basic: |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders |  | $ | 41.0 |  |  | $ | 72.7 |  |  | $ | 81.2 |  |  | $ | 108.4 |
Weighted-average common shares outstanding |  |  | 80.1 |  |  |  | 82.0 |  |  |  | 80.1 |  |  |  | 82.0 |
|  | $ | 0.51 |  |  | $ | 0.89 |  |  | $ | 1.01 |  |  | $ | 1.32 |
Net earnings per share - diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders |  | $ | 41.0 |  |  | $ | 72.7 |  |  | $ | 81.2 |  |  | $ | 108.4 |
Weighted-average common shares outstanding |  |  | 80.1 |  |  |  | 82.0 |  |  |  | 80.1 |  |  |  | 82.0 |
Effect of dilutive securities - stock options |  |  | 0.2 |  |  |  | 1.0 |  |  |  | 0.3 |  |  |  | 1.1 |
Effect of other share-based awards |  |  | 0.1 |  |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.6 |
|  |  | 80.4 |  |  |  | 83.3 |  |  |  | 80.8 |  |  |  | 83.7 |
|  | $ | 0.51 |  |  | $ | 0.87 |  |  | $ | 1.01 |  |  | $ | 1.30 |
There were 4.2 million and 1.7 million share-based awards excluded from the calculation of Net earnings per share - diluted for the three months and six months ended June 30, 2012 and 2011, respectively, as the exercise price for these awards was greater than the average market price of the common shares during the period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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