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Earnings per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Earnings per share | The following is a reconciliation of the number of shares and share equivalents used to calculate basic and diluted earnings per share (in millions, except per share amounts):
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Income from continuing operations |  | $ | 231.8 |  |  | $ | 177.6 |  |  | $ | 149.7 |
Income from discontinued operations, net of income taxes |  | 178.1 |  |  | 22.7 |  |  | 25.0 |
Net income |  | $ | 409.9 |  |  | $ | 200.3 |  |  | $ | 174.70 |
Weighted-average number of common shares outstanding - basic |  | 52.7 |  |  | 52.7 |  |  | 52.8 |
Dilutive effect of common share equivalents |  | 0.8 |  |  | 0.6 |  |  | 0.6 |
Weighted-average number of common shares and share equivalents outstanding - diluted |  | 53.5 |  |  | 53.3 |  |  | 53.4 |
Basic earnings per share: |  |  |  |  |  |
Continuing operations |  | $ | 4.40 |  |  | $ | 3.37 |  |  | $ | 2.84 |
Discontinued operations |  | 3.38 |  |  | 0.43 |  |  | 0.47 |
|  | $ | 7.78 |  |  | $ | 3.80 |  |  | $ | 3.31 |
Diluted earnings per share: |  |  |  |  |  |
Continuing operations |  | $ | 4.33 |  |  | $ | 3.33 |  |  | $ | 2.80 |
Discontinued operations |  | 3.33 |  |  | 0.43 |  |  | 0.48 |
|  | $ | 7.66 |  |  | $ | 3.76 |  |  | $ | 3.28 |

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