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EARNINGS PER-SHARE | 3 Months Ended
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Mar. 31, 2021
EARNINGS PER-SHARE |
EARNINGS PER-SHARE | 10. EARNINGS PER SHARE ​ Basic earnings per share is determined by dividing net income by the weighted average common shares outstanding during the period. The calculation of diluted earnings per share includes the dilutive effect of unexercised non-qualified stock options and non-vested restricted stock units. The computation of weighted average common shares outstanding excluded a nominal amount of anti-dilutive non-qualified stock options for each period ended March 31, 2021 and 2020. ​ The denominators used to compute basic and diluted earnings per share for the three months ended March 31, 2021 and 2020 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2021 | ​ | Three Months Ended March 31, 2020 | ​
​ |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |
​ | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common |
​ | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share |
(In millions, except per share amounts) | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount |
Basic: | ​ | $ | 87.2 |  | 43.4 | ​ | $ | 2.01 | ​ | $ | 3.8 |  | 43.0 | ​ | $ | 0.09 | ​
Effect of Dilutive Securities: | ​ | ​ | ​ |  | 0.4 | ​ | ​ | (0.02) | ​ | ​ | ​ |  | 0.3 | ​ | ​ | — | ​
Diluted: | ​ | $ | 87.2 | ​ | 43.8 | ​ | $ | 1.99 | ​ | $ | 3.8 | ​ | 43.3 | ​ | $ | 0.09 | ​
​

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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