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Stockholders' Equity and Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Stockholders' Equity and Earnings Per Common Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Share | Net income per common share is determined as follows:
| Year Ended December 31
| 2014 |  | 2013 |  | 2012
| (in millions of dollars, except share data)
Numerator |  |  |  |  |
Net Income | $ | 413.4 |  |  | $ | 858.1 |  |  | $ | 894.4 |
Denominator (000s) |  |  |  |  |
Weighted Average Common Shares - Basic | 255,525.9 |  |  | 264,725.8 |  |  | 281,355.9 |
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards | 1,126.9 |  |  | 1,223.4 |  |  | 400.9 |
Weighted Average Common Shares - Assuming Dilution | 256,652.8 |  |  | 265,949.2 |  |  | 281,756.8 |
Net Income Per Common Share |  |  |  |  |
Basic | $ | 1.62 |  |  | $ | 3.24 |  |  | $ | 3.18 |
Assuming Dilution | $ | 1.61 |  |  | $ | 3.23 |  |  | $ | 3.17 |
Treasury Stock Transactions | Our board of directors has authorized the repurchase of Unum Group's common stock under the following repurchase programs:
| Share Repurchase Program Authorized During
| December 2013 |  | July 2012 |  | February 2011
| (in millions of dollars)
Authorized Repurchase Amount | $ | 750.0 |  |  | $ | 750.0 |  |  | $ | 1,000.0 |
Remaining Repurchase Amount at Year End 2014 | $ | 429.5 |  |  | $ | — |  |  | $ | — |
The December 2013 share repurchase program has an expiration date of June 12, 2015. Common stock repurchases, which are classified as treasury stock until otherwise retired, were as follows:
| Year Ended December 31
| 2014 |  | 2013 |  | 2012
| (in millions of dollars)
Shares Repurchased | 8.7 |  |  | 11.2 |  |  | 23.6 |
Cost of Shares Repurchased (1) | $ | 300.6 |  |  | $ | 318.6 |  |  | $ | 500.6 |
(1) Includes commissions of $0.1 million, $0.2 million, and $0.6 million for the years ended December 31, 2014, 2013, and 2012, respectively.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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