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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(in millions, except per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Net income from continuing operations attributable to common shareholders | $ | 110.7 |  |  | $ | 13.4 |  |  | $ | 214.1 |  |  | $ | 71.1 |
Income from discontinued operations, net of tax (Note 3) | 27.6 |  |  | 1.4 |  | 32.6 |  | 6.5 |
Net income attributable to common shareholders | $ | 138.3 |  |  | $ | 14.8 |  |  | $ | 246.7 |  |  | $ | 77.6 |
Average basic shares outstanding | 58.5 |  |  | 58.0 |  |  | 58.4 |  | 58.5 |
Effect of dilutive share-based awards | 0.8 |  |  | 0.5 |  |  | 0.7 |  |  | 0.6 |
Average diluted shares outstanding | 59.3 |  |  | 58.5 |  |  | 59.1 |  | 59.1 |
Earnings per basic share: |  |  |  |  |  |  |
Earnings per basic share from continuing operations | $ | 1.89 |  |  | $ | 0.23 |  |  | $ | 3.67 |  |  | $ | 1.22 |
Earnings per basic share from discontinued operations | 0.47 |  |  | 0.03 |  |  | 0.55 |  |  | 0.11 |
Earnings per basic share | $ | 2.36 |  |  | $ | 0.26 |  |  | $ | 4.22 |  |  | $ | 1.33 |
Earnings per diluted share: |  |  |  |  |  |  |
Earnings per diluted share from continuing operations | $ | 1.87 |  |  | $ | 0.23 |  |  | $ | 3.62 |  |  | $ | 1.20 |
Earnings per diluted share from discontinued operations | 0.46 |  |  | 0.02 |  |  | 0.55 |  |  | 0.11 |
Earnings per diluted share | $ | 2.33 |  |  | $ | 0.25 |  |  | $ | 4.17 |  |  | $ | 1.31 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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