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Earnings Per Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding. The following table sets forth the computation of basic and diluted earnings per share:
| Years Ended December 31,
(Dollars and shares in millions, except per share amounts) | 2023 |  | 2022 |  | 2021
Numerator: |  |  |  |  |
Net income | $ | 56.6 |  |  | $ | 116.6 |  |  | $ | 108.1 |
Denominator: |  |  |  |  |
Weighted average shares outstanding - basic | 18.6 |  |  | 18.8 |  |  | 18.7 |
Effect of dilutive shares | 0.1 |  |  | 0.2 |  |  | 0.2 |
Weighted average shares outstanding - diluted | 18.7 |  |  | 19.0 |  |  | 18.9 |
Basic earnings per share | $ | 3.04 |  |  | $ | 6.21 |  |  | $ | 5.77 |
Diluted earnings per share | $ | 3.03 |  |  | $ | 6.15 |  |  | $ | 5.73 |
Dilutive shares are calculated using the treasury stock method and primarily include unvested restricted stock units. Anti-dilutive shares are excluded from the calculation of diluted shares and diluted earnings per share. For 2023, 2022 and 2021, an immaterial number of shares were excluded each year.

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