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Earnings Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share ("EPS") There are no adjustments required to be made to net income for purposes of computing basic and diluted EPS. The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
(Millions of shares) |  | 2019 |  | 2018 |  | 2017
Basic |  | 343.6 |  |  | 348.0 |  |  | 353.6 |
Dilutive effect of stock options and restricted share unit awards |  | 2.0 |  |  | 1.6 |  |  | 2.3 |
Diluted |  | 345.6 |  |  | 349.6 |  |  | 355.9 |
Options outstanding that were not included in the computation of diluted EPS because their exercise price was greater than the average market price of the common shares were insignificant. The number of common shares outstanding as of December 31, 2019, 2018 and 2017 was 341.4, 345.0 and 351.1, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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