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Net Income Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income Per Share |
20) | Net Income Per Share
The following is a reconciliation of basic to diluted net income per share:
|  | Years Ended December 31, |
Numerator: |  | 2020 |  |  | 2019 |  |  | 2018 |
Net income |  | $ | 350.1 |  |  | $ | 140.4 |  |  | $ | 392.9 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 55,095,000 |  |  |  | 54,711,000 |  |  |  | 54,406,000 |
Effect of dilutive securities |  |  | 255,000 |  |  |  | 400,000 |  |  |  | 586,000 |
Shares used in net income per common share – diluted |  |  | 55,350,000 |  |  |  | 55,111,000 |  |  |  | 54,992,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 6.36 |  |  | $ | 2.57 |  |  | $ | 7.22 |
Diluted |  | $ | 6.33 |  |  | $ | 2.55 |  |  | $ | 7.14 |
Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (RSUs and SARs) had been converted to such common shares, and if such assumed conversion is dilutive. In 2020, 2019 and 2018, the potential dilutive effect of 2,411, 65,664 and 79,500 weighted average shares, respectively, of RSUs, were excluded from the computation of diluted weighted-average shares outstanding, as the shares would have had an anti-dilutive effect on EPS.

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