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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding | The following is a reconciliation between basic and diluted weighted average shares outstanding:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(in millions, except per share data) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net income |  | $ | 190.4 |  |  | $ | 145.2 |  |  | $ | 425.9 |  |  | $ | 365.5 |
Net income attributable to unvested awarded performance stock |  |  | (2.8 | ) |  |  | (2.7 | ) |  |  | (6.8 | ) |  |  | (7.1 | )
Net income attributable to common shares |  | $ | 187.6 |  |  | $ | 142.5 |  |  | $ | 419.1 |  |  | $ | 358.4 |
Weighted average number of common shares outstanding – basic |  |  | 283.6 |  |  |  | 282.5 |  |  |  | 283.5 |  |  |  | 282.6 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (4.2 | ) |  |  | (5.3 | ) |  |  | (4.5 | ) |  |  | (5.5 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 279.4 |  |  |  | 277.2 |  |  |  | 279.0 |  |  |  | 277.1 |
Dilutive effect of potentially issuable common shares |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.3 |
Weighted average number of shares outstanding – diluted |  |  | 280.4 |  |  |  | 278.2 |  |  |  | 280.0 |  |  |  | 278.4 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.67 |  |  | $ | 0.51 |  |  | $ | 1.50 |  |  | $ | 1.29 |
Diluted |  | $ | 0.67 |  |  | $ | 0.51 |  |  | $ | 1.50 |  |  | $ | 1.29 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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