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Stockholders' Equity and Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract] |
Net Income Per Common Share | Net income per common share is determined as follows:
| Three Months Ended March 31
| 2013 |  | 2012
| (in millions of dollars, except share data)
Numerator |  |  |
Net Income | $ | 212.6 |  |  | $ | 213.9 |
Denominator (000s) |  |  |
Weighted Average Common Shares - Basic | 269,361.1 |  |  | 290,429.5 |
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards | 993.3 |  |  | 854.5 |
Weighted Average Common Shares - Assuming Dilution | 270,354.4 |  |  | 291,284.0 |
Net Income Per Common Share |  |  |
Basic | $ | 0.79 |  |  | $ | 0.74 |
Assuming Dilution | $ | 0.79 |  |  | $ | 0.73 |

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