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Stockholders' Equity and Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity and Earnings Per Common Share [Abstract] |
Earnings Per Share Disclosure | Earnings Per Common Share Net income per common share is determined as follows:
| Three Months Ended March 31
| 2018 |  | 2017
| (in millions of dollars, except share data)
Numerator |  |  |
Net Income | $ | 273.5 |  |  | $ | 229.9 |
Denominator (000s) |  |  |
Weighted Average Common Shares - Basic | 221,894.0 |  |  | 229,429.6 |
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards | 683.0 |  |  | 949.2 |
Weighted Average Common Shares - Assuming Dilution | 222,577.0 |  |  | 230,378.8 |
Net Income Per Common Share |  |  |
Basic | $ | 1.23 |  |  | $ | 1.00 |
Assuming Dilution | $ | 1.23 |  |  | $ | 1.00 |
We use the treasury stock method to account for the effect of outstanding stock options, nonvested restricted stock units, and nonvested performance share units on the computation of diluted earnings per share. Under this method, these potential common shares will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the exercise price of the stock options and the grant price of the nonvested restricted stock units and the nonvested performance share units. The outstanding stock options have exercise prices ranging from $23.35 to $26.29, the nonvested restricted stock units have grant prices ranging from $27.85 to $55.26, and the nonvested performance share units have grant prices ranging from $27.85 to $49.86. In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares excluded in the computation of diluted earnings per share because the impact would be antidilutive, based on then current market prices, approximated a de minimis amount and 0.4 million for the three months ended March 31, 2018 and 2017, respectively.
Stockholders' Equity Disclosure | Common Stock During the second quarter of 2017, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's outstanding common stock through November 25, 2018. This authorization replaced the previous authorization of $750.0 million that was scheduled to expire on November 26, 2017. The remaining repurchase amount under the new program was $412.8 million at March 31, 2018. Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:
| Three Months Ended March 31
| 2018 |  | 2017
| (in millions)
Shares Repurchased | 1.9 |  |  | 2.1 |
Cost of Shares Repurchased 1 | $ | 100.2 |  |  | $ | 100.0 |
1 Includes commissions of $0.2 million for the three months ended March 31, 2018, and a de minimis amount for the three months ended March 31, 2017. Preferred Stock Unum Group has 25.0 million shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

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- Definition Stockholders' Equity and Earnings Per Common Share [Abstract] + References No definition available. + Details
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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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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