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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2022
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 September 30, |  |  | Nine months ended September 30, |
(in millions, except per share data) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net income |  | $ | 161.1 |  |  | $ | 146.4 |  |  | $ | 526.6 |  |  | $ | 485.4 |
Net income attributable to unvested awarded performance stock |  |  | (2.9 | ) |  |  | (3.1 | ) |  |  | (10.1 | ) |  |  | (10.9 | )
Net income attributable to common shares |  | $ | 158.2 |  |  | $ | 143.3 |  |  | $ | 516.5 |  |  | $ | 474.5 |
Weighted average number of common shares outstanding – basic |  |  | 283.0 |  |  |  | 282.1 |  |  |  | 282.7 |  |  |  | 282.1 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (5.2 | ) |  |  | (5.9 | ) |  |  | (5.4 | ) |  |  | (6.3 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 277.8 |  |  |  | 276.2 |  |  |  | 277.3 |  |  |  | 275.8 |
Dilutive effect of potentially issuable common shares |  |  | 0.9 |  |  |  | 1.3 |  |  |  | 1.2 |  |  |  | 1.3 |
Weighted average number of shares outstanding – diluted |  |  | 278.7 |  |  |  | 277.5 |  |  |  | 278.5 |  |  |  | 277.1 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.57 |  |  | $ | 0.52 |  |  | $ | 1.86 |  |  | $ | 1.72 |
Diluted |  | $ | 0.57 |  |  | $ | 0.52 |  |  | $ | 1.85 |  |  | $ | 1.71 |

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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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