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Earnings Per Share | 3 Months Ended
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Mar. 31, 2022
Earnings Per Share [Abstract] |
Earnings Per Share | 11. Earnings Per Share Basic earnings per share represents net income divided by the weighted-average number of common shares outstanding for the period. Diluted earnings per share represents net income divided by the weighted-average number of common shares outstanding, inclusive of the effect of dilutive securities, such as outstanding SARs, restricted stock units, and convertible notes. The following are the common share amounts used to compute the basic and diluted earnings per share for each period:
|  | Three Months Ended |
|  | March 31, 2022 |  |  | March 31, 2021 |
|  | (in millions) |
Weighted-average shares used in basic computations |  |  | 99.9 |  |  |  | 108.4 |
Dilutive effect of exercise of equity grants outstanding |  |  | 1.8 |  |  |  | 2.7 |
Weighted-average shares used in diluted computations |  |  | 101.7 |  |  |  | 111.1 |
There were an aggregate of 1.6 million and 1.1 million of equity grants, consisting of SARs and restricted stock units, that were outstanding during the three months ended March 31, 2022 and 2021, respectively, but were not included in the computation of diluted earnings per share because their effect would be anti-dilutive or the performance condition of the award had not been satisfied. For the 2024 Convertible Notes, the Company is required to settle the principal amount in cash and has the option to settle the conversion feature for the amount above the conversion price, or the conversion spread, in common shares or cash. The Company uses the if-converted stock method for calculating any potential dilutive effect of the conversion spread on diluted earnings per share, if applicable. The conversion spread will have a dilutive impact on diluted earnings per share when the average market price of the Company’s common shares for a given period exceeds the conversion price of the 2024 Convertible Notes. For the three months ended March 31, 2022 and 2021, the 2024 Convertible Notes have been excluded from the computation of diluted earnings per share, as the effect would be anti-dilutive since the conversion price of the 2024 Convertible Notes exceeded the average market price of the Company’s common shares for the three months ended March 31, 2022 and 2021. The initial conversion rate and conversion price for the 2024 Convertible Notes are described further in Note 4, Long-Term Debt. See Note 10, Shareholders’ Deficit, for a discussion of how common shares repurchased by the Company’s indirect wholly-owned subsidiary are treated under U.S. GAAP.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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