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Earnings Per Share (Notes) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings per share | The following table shows the calculation of basic and diluted earnings per share (in millions, except per share data):
| Three Months Ended |  | Six Months Ended |  |
| June 30, |  | June 30, |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Income from continuing operations | $ | 57.3 |  |  | $ | 43.5 |  |  | $ | 100.1 |  |  | $ | 82.6 |  |  |  |  |
Income from discontinued operations, net of income taxes | 6.9 |  |  | 5.3 |  |  | 12.8 |  |  | 10.0 |  |  |  |  |
Net income | $ | 64.2 |  |  | $ | 48.8 |  |  | $ | 112.9 |  |  | $ | 92.6 |  |  |  |  |
Weighted-average number of common shares outstanding - basic | 53.2 |  |  | 52.5 |  |  | 53.1 |  |  | 52.7 |  |  |  |  |
Dilutive effect of common share equivalents | 0.7 |  |  | 0.5 |  |  | 0.7 |  |  | 0.4 |  |  |  |  |
Weighted-average number of common shares and share equivalents outstanding - diluted | 53.9 |  |  | 53.0 |  |  | 53.8 |  |  | 53.1 |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ | 1.08 |  |  | $ | 0.83 |  |  | $ | 1.89 |  |  | $ | 1.57 |  |  |  |  |
Discontinued operations | 0.13 |  |  | 0.10 |  |  | 0.24 |  |  | 0.19 |  |  |  |  |
| $ | 1.21 |  |  | $ | 0.93 |  |  | $ | 2.13 |  |  | $ | 1.76 |  |  |  |  |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ | 1.06 |  |  | $ | 0.82 |  |  | $ | 1.86 |  |  | $ | 1.56 |  |  |  |  |
Discontinued operations | 0.13 |  |  | 0.10 |  |  | 0.24 |  |  | 0.18 |  |  |  |  |
| $ | 1.19 |  |  | $ | 0.92 |  |  | $ | 2.10 |  |  | $ | 1.74 |  |  |  |  |

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