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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 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 September 30, 2021 and 2020. ​ The computations for basic and diluted earnings per share for the three and nine months ended September 30, 2021 and 2020 are as follows: ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, 2021 | ​ | Nine Months Ended September 30, 2021
​ |  | ​ | ​ |  | 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 | ​ | $ | 283.2 |  | 42.9 | ​ | $ | 6.60 | ​ | $ | 532.9 |  | 43.3 | ​ | $ | 12.31
Effect of Dilutive Securities | ​ | ​ | ​ |  | 0.5 | ​ | ​ | (0.07) | ​ | ​ | ​ |  | 0.4 | ​ | ​ | (0.12)
Diluted | ​ | $ | 283.2 | ​ | 43.4 | ​ | $ | 6.53 | ​ | $ | 532.9 | ​ | 43.7 | ​ | $ | 12.19
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, 2020 | ​ | Nine Months Ended September 30, 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 | ​ | $ | 70.9 |  | 43.1 | ​ | $ | 1.65 | ​ | $ | 107.5 |  | 43.0 | ​ | $ | 2.50
Effect of Dilutive Securities | ​ | ​ | ​ |  | 0.4 | ​ | ​ | (0.02) | ​ | ​ | ​ |  | 0.4 | ​ | ​ | (0.02)
Diluted | ​ | $ | 70.9 | ​ | 43.5 | ​ | $ | 1.63 | ​ | $ | 107.5 | ​ | 43.4 | ​ | $ | 2.48
​

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