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Earnings Per Share | 6 Months Ended
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Jun. 30, 2022
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share has been computed based upon the weighted average number of common shares outstanding. Diluted earnings per share has been computed based upon the weighted average number of common shares outstanding plus the effect of all potentially dilutive common stock equivalents, except when the effect would be anti-dilutive. The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data).
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Basic and diluted earnings per share: |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income, basic and diluted | $ | 72.2 |  |  | $ | 47.1 |  |  | $ | 130.7 |  |  | $ | 80.0 |
Denominator: |  |  |  |  |  |  |
Basic weighted average common shares | 29.8 |  |  | 29.6 |  |  | 29.8 |  |  | 29.5 |
Stock options, RSUs and PSUs | 0.5 |  |  | 0.8 |  |  | 0.6 |  |  | 0.8 |
Weighted average shares used to calculate diluted earnings per share | 30.3 |  |  | 30.4 |  |  | 30.4 |  |  | 30.3 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 2.42 |  |  | $ | 1.59 |  |  | $ | 4.39 |  |  | $ | 2.71 |
Diluted | $ | 2.38 |  |  | $ | 1.55 |  |  | $ | 4.30 |  |  | $ | 2.64 |
Antidilutive stock options, RSUs and PSUs | 0.2 |  |  | — |  |  | 0.1 |  |  | — |

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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 https://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 https://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 https://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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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