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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  |  | Nine months ended September 30, |
(in millions, except per share data) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net income |  | $ | 175.9 |  |  | $ | 161.1 |  |  | $ | 601.8 |  |  | $ | 526.6 |
Net income attributable to unvested awarded performance stock |  |  | (2.6 | ) |  |  | (2.9 | ) |  |  | (9.4 | ) |  |  | (10.1 | )
Net income attributable to common shares |  | $ | 173.3 |  |  | $ | 158.2 |  |  | $ | 592.4 |  |  | $ | 516.5 |
Weighted average number of common shares outstanding – basic |  |  | 284.1 |  |  |  | 283.0 |  |  |  | 283.7 |  |  |  | 282.7 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (4.2 | ) |  |  | (5.2 | ) |  |  | (4.4 | ) |  |  | (5.4 | )
Weighted average number of common shares outstanding for basic net income per common share |  |  | 279.9 |  |  |  | 277.8 |  |  |  | 279.3 |  |  |  | 277.3 |
Dilutive effect of potentially issuable common shares |  |  | 1.4 |  |  |  | 0.9 |  |  |  | 1.1 |  |  |  | 1.2 |
Weighted average number of shares outstanding – diluted |  |  | 281.3 |  |  |  | 278.7 |  |  |  | 280.4 |  |  |  | 278.5 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.62 |  |  | $ | 0.57 |  |  | $ | 2.12 |  |  | $ | 1.86 |
Diluted |  | $ | 0.62 |  |  | $ | 0.57 |  |  | $ | 2.11 |  |  | $ | 1.85 |

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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 -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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