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Net Income Per Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted net income per share is computed using the weighted average number of common shares outstanding and, when dilutive, common share equivalents. The computation of basic and diluted net income per share was as follows:
| Years Ended December 31,
(in millions, except share and per share data) | 2023 |  | 2022 |  | 2021
Net income | $ | 206.3 |  |  | $ | 4.6 |  |  | $ | 16.8 |
Add back interest expense, net of tax attributable to assumed conversion of convertible senior notes | 10.4 |  |  | — |  |  | — |
Net income, diluted | $ | 216.7 |  |  | $ | 4.6 |  |  | $ | 16.8 |
Weighted average number of common shares outstanding, basic (in thousands) | 69,751 |  |  | 69,375 |  |  | 67,698 |
Convertible Notes | 3,528 |  |  | — |  |  | — |
Stock options | 286 |  |  | 454 |  |  | 686 |
Restricted stock units | 68 |  |  | 81 |  |  | 195 |
Weighted average number of common shares outstanding, diluted (in thousands) | 73,633 |  |  | 69,910 |  |  | 68,579 |
Net income per share |  |  |  |  |
Basic | $ | 2.96 |  |  | $ | 0.07 |  |  | $ | 0.25 |
Diluted | $ | 2.94 |  |  | $ | 0.07 |  |  | $ | 0.24 |
The number of common share equivalents excluded from the computation of diluted net income per share because either the effect would have been anti-dilutive, or the performance criteria related to the units had not yet been met, were as follows:
| Years Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Restricted stock units | 322 |  |  | 227 |  |  | 166 |
Stock options | 163 |  |  | 137 |  |  | 53 |
0.375% Convertible Senior Notes | — |  |  | 3,528 |  |  | 3,528 |
1.375% Convertible Senior Notes | — |  |  | — |  |  | 2,024 |
Total | 485 |  |  | 3,892 |  |  | 5,771 |

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