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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
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) | 2020 |  | 2019 |  | 2020 |  | 2019
Net income attributable to common shareholders | $ | 14.8 |  |  | $ | 91.0 |  |  | $ | 77.6 |  |  | $ | 173.4 |
Average basic shares outstanding | 58.0 |  |  | 59.9 |  |  | 58.5 |  |  | 59.8 |
Effect of dilutive share-based awards | 0.5 |  |  | 0.9 |  |  | 0.6 |  |  | 1.0 |
Average diluted shares outstanding | 58.5 |  |  | 60.8 |  |  | 59.1 |  |  | 60.8 |
Earnings per basic share | $ | 0.26 |  |  | $ | 1.52 |  |  | $ | 1.33 |  |  | $ | 2.90 |
Earnings per diluted share | $ | 0.25 |  |  | $ | 1.50 |  |  | $ | 1.31 |  |  | $ | 2.85 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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