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Earnings Per Share Attributable to Common Stockholders | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Share Attributable to Common Stockholders | 9. Earnings Per Share Attributable to Common Stockholders Basic EPS attributable to common stockholders has been calculated by dividing the net income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS attributable to common stockholders was calculated by dividing the net income available to common stockholders by the weighted average number of shares of common stock outstanding, if the potentially dilutive securities had been issued. Potentially dilutive securities include unvested PSUs, unvested RSUs, outstanding stock options and stock committed under the Employee Stock Purchase Plan ("2023 ESPP"), a plan implemented and approved by the Company on June 15, 2023. The dilutive effect of potentially dilutive securities is reflected in diluted EPS by application of the treasury stock method. Under the treasury stock method, an increase in the fair market value of the Company’s common stock can result in a greater dilutive effect from potentially dilutive securities.
Year ended December 31, |  | 2023 |  | 2022 |  | 2021
Net income available to common stockholders |  | $ | 174.9 |  |  | $ | 319.7 |  |  | $ | 151.9 |
Denominator: |  |  |  |  |  |
Basic weighted average share outstanding |  | 166,963,575 |  | 110,781,282 |  | 110,315,782
Effect of dilutive securities: |  |  |  |  |  |
Share units |  | 689,290 |  | 516,144 |  | 388,083
Stock options and ESPP |  | 551,116 |  | 588,599 |  | 702,965
Diluted average shares outstanding |  | 168,203,981 |  | 111,886,025 |  | 111,406,830
Net income per share attributable to common shares: |  |  |  |  |  |
Basic |  | $ | 1.05 |  |  | $ | 2.89 |  |  | $ | 1.38 |
Diluted |  | $ | 1.04 |  |  | $ | 2.86 |  |  | $ | 1.36 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
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