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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding | The following is a reconciliation between basic and diluted weighted average shares outstanding for the years ended December 31:
(in millions, except per share data) |  | 2023 |  |  | 2022 |  |  | 2021 |
Net income |  | $ | 870.5 |  |  | $ | 671.8 |  |  | $ | 587.1 |
Net income attributable to unvested awarded performance stock |  |  | (13.3 | ) |  |  | (12.7 | ) |  |  | (12.9 | )
Net income attributable to common shares |  | $ | 857.2 |  |  | $ | 659.1 |  |  | $ | 574.2 |
Weighted average number of common shares outstanding – basic |  |  | 283.9 |  |  |  | 282.9 |  |  |  | 282.2 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (4.3 | ) |  |  | (5.4 | ) |  |  | (6.2 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 279.6 |  |  |  | 277.5 |  |  |  | 276.0 |
Dilutive effect of stock options |  |  | 1.2 |  |  |  | 1.1 |  |  |  | 1.4 |
Weighted average number of shares outstanding – diluted |  |  | 280.8 |  |  |  | 278.6 |  |  |  | 277.4 |
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 3.07 |  |  | $ | 2.38 |  |  | $ | 2.08 |
Diluted |  | $ | 3.05 |  |  | $ | 2.37 |  |  | $ | 2.07 |

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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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