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Earnings per Share | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Earnings per Share | EARNINGS PER SHARE Basic earnings per share are based upon the weighted-average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted-average number of shares of common stock outstanding, plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. Our potentially dilutive securities consist of stock options, SSARs, restricted stock or units and performance share awards.
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
2019 |  | 2018 |  | 2019 |  | 2018
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted average common shares outstanding - basic | 121.4 |  |  | 142.5 |  |  | 125.1 |  |  | 143.9 |
Effect of dilutive securities: |  |  |  |  |  |  |
Dilutive effect of employee stock plans | 0.8 |  |  | 1.4 |  |  | 0.9 |  |  | 1.7 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Weighted average shares outstanding - diluted | 122.2 |  |  | 143.9 |  |  | 125.9 |  |  | 145.6 |
For the quarter and nine months ended September 30, 2019 and 2018, there were no SSARs that were considered not in-the-money for purposes of our earnings per share calculation.

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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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