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Net Earnings Per Share | 6 Months Ended
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Jun. 30, 2012
Net Earnings Per Share [Abstract] |
Net Earnings Per Share | (7) 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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