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Earnings Per Share | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | The calculations of basic and diluted EPS are based on the weighted average number of shares of common stock and potential common stock outstanding during the period. For the purposes of determining diluted EPS, the shares underlying the purchase contracts included within the Equity Units were included in the calculation of potential common stock outstanding for the three and nine months ended September 30, 2023 and 2022 using the if-converted method under US GAAP. For the purchase contracts, the number of shares of our common stock that would be issuable at the end of each reporting period will be reflected in the denominator of our diluted EPS calculation. If the stock price falls below the initial reference price of $24.51, subject to anti-dilution adjustments, the number of shares of our common stock used in calculating diluted EPS will be the maximum number of shares per the contract as described in Note 5, "Equity." Conversely, if the stock price is above the initial reference price of $24.51, subject to anti-dilution adjustments, a variable number of shares of our common stock will be used in calculating diluted EPS. A numerator adjustment is reflected in the calculation of diluted EPS for interest expense incurred for the three and nine months ended September 30, 2023 and 2022 net of tax, related to the purchase contracts. We adopted ASU 2020-06 on January 1, 2022, which requires us to assume share settlement of the remaining purchase contract payment balance from our Equity Units based on the average share price during the period. The shares underlying the Series C Mandatory Convertible Preferred Stock included within the Equity Units are contingently convertible as the conversion is contingent on a successful remarketing as described in Note 5, "Equity." Contingently convertible shares where conversion is not tied to a market price trigger are excluded from the calculation of diluted EPS until such time as the contingency has been resolved under the if-converted method. As of September 30, 2023 and 2022, the contingency was not resolved and thus no shares were reflected in the denominator in the calculation of diluted EPS for the three and nine months ended September 30, 2023 and 2022. Diluted EPS also includes the incremental effects of the various long-term incentive compensation plans and the open ATM forward agreements during the period under the treasury stock method when the impact would be dilutive. We began using the two-class method of computing earnings per share in 2023 because we have participating securities in the form of non-vested restricted stock units with a non-forfeitable right to dividend equivalents, for which vesting is predicated solely on the passage of time. The calculation of earnings per share using the two-class method excludes income attributable to these participating securities from the numerator and excludes the dilutive impact of those shares from the denominator. During 2022, we had no outstanding securities other than common and preferred stock, which required holders’ participation in dividends and earnings; therefore, we were not required to calculate EPS under the two-class method. Basic net income per share is computed by dividing net income available to common shareholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share is computed by giving effect to all potential shares of common stock, to the extent they are dilutive. The following table presents the calculation of our basic and diluted EPS:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions, except per share amounts) | 2023 |  | 2022 |  | 2023 |  | 2022
Numerator: |  |  |  |  |  |  |
Net Income Available to Common Shareholders | $ | 77.0 |  |  | $ | 52.0 |  |  | $ | 436.1 |  |  | $ | 518.2 |
Less: Income allocated to participating securities | 0.1 |  |  | — |  |  | 0.3 |  |  | — |
Net Income Available to Common Shareholders - Basic | 76.9 |  |  | 52.0 |  |  | 435.8 |  |  | 518.2 |
Add: Dilutive effect of Equity Units | 0.4 |  |  | 0.5 |  |  | 1.2 |  |  | 1.5 |
Net Income Available to Common Shareholders - Diluted | $ | 77.3 |  |  | $ | 52.5 |  |  | $ | 437.0 |  |  | $ | 519.7 |
Denominator: |  |  |  |  |  |  |
Average common shares outstanding - Basic | 413.5 |  |  | 406.5 |  |  | 413.2 |  |  | 406.3 |
Dilutive potential common shares: |  |  |  |  |  |  |
Equity Units purchase contracts | 33.1 |  |  | 31.3 |  |  | 31.9 |  |  | 29.4 |
Equity Units purchase contract payment balance | 0.6 |  |  | 3.0 |  |  | 1.2 |  |  | 3.4 |
Shares contingently issuable under employee stock plans | 0.7 |  |  | 0.9 |  |  | 0.7 |  |  | 1.0 |
Shares restricted under employee stock plans | 0.4 |  |  | 0.6 |  |  | 0.4 |  |  | 0.5 |
ATM forward agreements | — |  |  | 1.1 |  |  | — |  |  | 1.1 |
Average Common Shares - Diluted | 448.3 |  |  | 443.4 |  |  | 447.4 |  |  | 441.7 |
Earnings per common share: |  |  |  |  |  |  |
Basic | $ | 0.19 |  |  | $ | 0.13 |  |  | $ | 1.05 |  |  | $ | 1.28 |
Diluted | $ | 0.17 |  |  | $ | 0.12 |  |  | $ | 0.98 |  |  | $ | 1.18 |

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