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EARNINGS PER-SHARE | 12 Months Ended
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Dec. 31, 2019
EARNINGS PER-SHARE |
EARNINGS PER-SHARE | 14.EARNINGS PER SHARE ​ Basic earnings per share are determined by dividing net income by the weighted-average common shares outstanding during the year. The calculation of diluted earnings per share includes the dilutive effect of unexercised non-qualified stock options and non-vested stock units. The computation of weighted average dilutive shares outstanding excluded a nominal amount of anti-dilutive non-qualified stock options for each of the years 2019, 2018 and 2017. ​ The denominators used to compute basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2019 | ​ | Year Ended December 31, 2018 | ​ | Year Ended December 31, 2017 |
​ |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |
​ | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common |
​ | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share |
(In millions, except per share amounts) | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount |
Basic: | ​ | $ | 82.7 |  | 42.8 | ​ | $ | 1.93 | ​ | $ | 109.0 |  | 42.7 | ​ | $ | 2.55 | ​ | $ | 231.0 |  | 42.9 | ​ | $ | 5.38 | ​
Effect of Dilutive Securities: | ​ | ​ | ​ |  | 0.5 | ​ | ​ | (0.02) | ​ | ​ | ​ |  | 0.3 | ​ | ​ | (0.02) | ​ | ​ | ​ |  | 0.3 | ​ | ​ | (0.03) | ​
Diluted: | ​ | $ | 82.7 | ​ | 43.3 | ​ | $ | 1.91 | ​ | $ | 109.0 | ​ | 43.0 | ​ | $ | 2.53 | ​ | $ | 231.0 | ​ | 43.2 | ​ | $ | 5.35 | ​
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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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