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Stockholders' Equity and Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2023
Stockholders' Equity and Earnings Per Common Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Share | Net income per common share is determined as follows:
| Three Months Ended March 31
| 2023 |  | 2022
| (in millions of dollars, except share data)
Numerator |  |  |
Net Income | $ | 358.3 |  |  | $ | 240.4 |
Denominator (000s) |  |  |
Weighted Average Common Shares - Basic | 198,111.2 |  |  | 202,628.8 |
Dilution for Assumed Exercises of Nonvested Stock Awards | 1,408.9 |  |  | 875.5 |
Weighted Average Common Shares - Assuming Dilution | 199,520.1 |  |  | 203,504.3 |
Net Income Per Common Share |  |  |
Basic | $ | 1.81 |  |  | $ | 1.19 |
Assuming Dilution | $ | 1.80 |  |  | $ | 1.18 |
Treasury Stock Transactions | Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:
| Three Months Ended March 31
| 2023 |  | 2022 |  |
| (in millions)
Shares Repurchased | 1.3 |  |  | 1.3 |  |  |
Cost of Shares Repurchased 1 | $ | 53.6 |  |  | $ | 37.5 |  |  |
1Includes a de minimis amount of commissions and $0.1 million of excise tax for the three months ended March 31, 2023. There were no commissions or excise taxes during the three months ended March 31, 2022.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481520/505-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481520/505-30-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481520/505-30-50-4 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481549/505-30-45-1 + Details
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