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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
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) | 2023 |  | 2022 |  | 2023 |  | 2022
Net income attributable to common shareholders | $ | 43.2 |  |  | $ | 48.8 |  |  | $ | 86.9 |  |  | $ | 98.3 |
Average basic shares outstanding | 56.8 |  |  | 56.7 |  |  | 56.8 |  | 56.7 |
Effect of dilutive share-based awards | 0.6 |  |  | — |  |  | 0.6 |  |  | — |
Average diluted shares outstanding | 57.4 |  |  | 56.7 |  |  | 57.4 |  |  | 56.7 |
Earnings per basic share | $ | 0.76 |  |  | $ | 0.86 |  |  | $ | 1.53 |  |  | $ | 1.73 |
Earnings per diluted share | $ | 0.75 |  |  | $ | 0.86 |  |  | $ | 1.51 |  |  | $ | 1.73 |

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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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