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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2023
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) | 2023 |  | 2022 |  | 2023 |  | 2022
Net income (loss) from continuing operations attributable to common shareholders | $ | 55.2 |  |  | $ | (120.9) |  |  | $ | 154.4 |  |  | $ | 131.8 |
Income from discontinued operations, net of tax (Note 2) | — |  |  | 61.6 |  | 52.1 |  | 172.1 |
Net income (loss) attributable to common shareholders | $ | 55.2 |  |  | $ | (59.3) |  |  | $ | 206.5 |  |  | $ | 303.9 |
Average basic shares outstanding | 56.8 |  |  | 56.1 |  |  | 56.7 |  | 56.5 |
Effect of dilutive share-based awards | 0.7 |  |  | — |  |  | 0.7 |  |  | 0.8
Average diluted shares outstanding | 57.5 |  |  | 56.1 |  |  | 57.4 |  |  | 57.3 |
Earnings (loss) per basic share: |  |  |  |  |  |  |
Earnings (loss) per basic share from continuing operations | $ | 0.97 |  |  | $ | (2.16) |  |  | $ | 2.72 |  |  | $ | 2.33 |
Earnings per basic share from discontinued operations | — |  |  | 1.10 |  |  | 0.92 |  |  | 3.05 |
Earnings (loss) per basic share | $ | 0.97 |  |  | $ | (1.06) |  |  | $ | 3.64 |  |  | $ | 5.38 |
Earnings (loss) per diluted share: |  |  |  |  |  |  |
Earnings (loss) per diluted share from continuing operations | $ | 0.96 |  |  | $ | (2.16) |  |  | $ | 2.69 |  |  | $ | 2.30 |
Earnings per diluted share from discontinued operations | — |  |  | 1.10 |  |  | 0.91 |  |  | 3.00 |
Earnings (loss) per diluted share | $ | 0.96 |  |  | $ | (1.06) |  |  | $ | 3.60 |  |  | $ | 5.30 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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