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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions, except per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Net income from continuing operations attributable to common shareholders | $ | 111.4 |  |  | $ | 49.4 |  |  | $ | 325.5 |  |  | $ | 120.3 |
Income from discontinued operations, net of tax (Note 3) | 5.2 |  |  | 7.2 |  | 37.8 |  | 13.9 |
Net income attributable to common shareholders | $ | 116.6 |  |  | $ | 56.6 |  |  | $ | 363.3 |  |  | $ | 134.2 |
Average basic shares outstanding | 58.7 |  |  | 58.1 |  |  | 58.5 |  | 58.4 |
Effect of dilutive share-based awards | 0.8 |  |  | 0.4 |  |  | 0.7 |  |  | 0.5 |
Average diluted shares outstanding | 59.5 |  |  | 58.5 |  |  | 59.2 |  | 58.9 |
Earnings per basic share: |  |  |  |  |  |  |
Earnings per basic share from continuing operations | $ | 1.90 |  |  | $ | 0.85 |  |  | $ | 5.56 |  |  | $ | 2.06 |
Earnings per basic share from discontinued operations | 0.09 |  |  | 0.12 |  |  | 0.65 |  |  | 0.24 |
Earnings per basic share | $ | 1.99 |  |  | $ | 0.97 |  |  | $ | 6.21 |  |  | $ | 2.30 |
Earnings per diluted share: |  |  |  |  |  |  |
Earnings per diluted share from continuing operations | $ | 1.87 |  |  | $ | 0.84 |  |  | $ | 5.50 |  |  | $ | 2.04 |
Earnings per diluted share from discontinued operations | 0.09 |  |  | 0.13 |  |  | 0.64 |  |  | 0.24 |
Earnings per diluted share | $ | 1.96 |  |  | $ | 0.97 |  |  | $ | 6.14 |  |  | $ | 2.28 |

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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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