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Stockholders' Equity and Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30 |  | Six Months Ended June 30
| 2022 |  | 2021 |  | 2022 |  | 2021
| (in millions of dollars, except share data)
Numerator |  |  |  |  |  |  |
Net Income | $ | 370.4 |  |  | $ | 182.9 |  |  | $ | 623.9 |  |  | $ | 335.9 |
Denominator (000s) |  |  |  |  |  |  |
Weighted Average Common Shares - Basic | 201,151.7 |  |  | 204,504.5 |  |  | 201,888.8 |  |  | 204,323.1 |
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards | 1,280.0 |  |  | 769.3 |  |  | 1,077.7 |  |  | 686.7 |
Weighted Average Common Shares - Assuming Dilution | 202,431.7 |  |  | 205,273.8 |  |  | 202,966.5 |  |  | 205,009.8 |
Net Income Per Common Share |  |  |  |  |  |  |
Basic | $ | 1.84 |  |  | $ | 0.89 |  |  | $ | 3.09 |  |  | $ | 1.64 |
Assuming Dilution | $ | 1.83 |  |  | $ | 0.89 |  |  | $ | 3.07 |  |  | $ | 1.64 |
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 June 30 |  | Six Months Ended June 30 |
| 2022 |  | 2021 |  | 2022 |  | 2021 |  |
| (in millions of dollars, except share data)
Shares Repurchased (000s) | 1,735.5 |  |  | — |  |  | 3,078.6 |  |  | — |  |  |
Cost of Shares Repurchased 1 | $ | 57.4 |  |  | $ | — |  |  | $ | 94.9 |  |  | $ | — |  |  |
1 Includes commissions of $0.1 million for the three and six months ended June 30, 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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