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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The weighted average number of shares outstanding used to compute earnings per common share were as follows (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average common shares outstanding for basic computations |  | 287.8 |  |  | 299.3 |  |  | 310.3 |
Weighted average dilutive effect of equity awards |  | 2.8 |  |  | 3.8 |  |  | 4.4 |
Weighted average common shares outstanding for diluted computations |  | 290.6 |  |  | 303.1 |  |  | 314.7 |
We compute basic and diluted earnings per common share by dividing net earnings by the respective weighted average number of common shares outstanding for the periods presented. Our calculation of diluted earnings per common share also includes the dilutive effects for the assumed vesting of outstanding restricted stock units (RSUs), performance stock units (PSUs) and exercise of outstanding stock options based on the treasury stock method. There were no significant anti-dilutive equity awards for the years ended December 31, 2017, 2016 and 2015.

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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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