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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
| Three Months Ended
| March 31,
(in millions, except per share data) | 2021 |  | 2020
Net income attributable to common shareholders | $ | 108.4 |  |  | $ | 62.8 |
Average basic shares outstanding | 58.2 |  |  | 58.8 |
Effect of dilutive share-based awards | 0.7 |  |  | 0.8 |
Average diluted shares outstanding | 58.9 |  |  | 59.6 |
Earnings per basic share | $ | 1.86 |  |  | $ | 1.07 |
Earnings per diluted share | $ | 1.84 |  |  | $ | 1.05 |

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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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