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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share Computations | The following table provides a reconciliation of basic and diluted earnings per share computations for the years ended December 31, 2020, 2019 and 2018 (in millions, except per share amounts):
| Years ended December 31,
(Millions of dollars except per share amounts) | 2020 |  | 2019 |  | 2018
Earnings per common share: |  |  |  |  |
Net income per share - basic |  |  |  |  |
Net income attributable to common stockholders | $ | 386.1 |  |  | $ | 154.8 |  |  | $ | 213.6 |
Weighted average common shares outstanding (in thousands) | 29,132 |  |  | 31,594 |  |  | 32,674 |
Earnings per common share | $ | 13.25 |  |  | $ | 4.90 |  |  | $ | 6.54 |
Earnings per common share - assuming dilution: |
Net income per share - diluted |  |  |  |  |
Net income attributable to common stockholders | $ | 386.1 |  |  | $ | 154.8 |  |  | $ | 213.6 |
Weighted average common shares outstanding (in thousands) | 29,132 |  |  | 31,594 |  |  | 32,674 |
Common equivalent shares: |  |  |  |  |
Share-based awards | 394 |  |  | 264 |  |  | 309 |
Weighted average common shares outstanding - assuming dilution (in thousands) | 29,526 |  |  | 31,858 |  |  | 32,983 |
Earnings per common share assuming dilution | $ | 13.08 |  |  | $ | 4.86 |  |  | $ | 6.48 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method and are reported in the table below.
|  | Years ended December 31,
Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive |  | 2020 |  | 2019 |  | 2018
Stock options |  | 75,600 |  |  | 94,600 |  |  | 76,400 |
Restricted share units |  | 20,137 |  |  | 843 |  |  | 121 |
Total anti-dilutive shares |  | 95,737 |  |  | 95,443 |  |  | 76,521 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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