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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 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 three and six months ended June 30, 2020 and 2019:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
(Millions of dollars, except share and per share amounts) | 2020 |  | 2019 |  | 2020 |  | 2019
Earnings per common share: |  |  |  |  |  |  |
Net income per share - basic |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 168.9 |  |  | $ | 32.7 |  |  | $ | 258.2 |  |  | $ | 38.0 |
Weighted average common shares outstanding (in thousands) | 29,181 |  |  | 32,112 |  |  | 29,708 |  |  | 32,159 |
Earnings per common share | $ | 5.79 |  |  | $ | 1.02 |  |  | $ | 8.69 |  |  | $ | 1.18 |
Earnings per common share - assuming dilution: |  |  |  |  |  |  |
Net income per share - diluted |  |  |  |  |  |  |
Net income attributable to common stockholders | $ | 168.9 |  |  | $ | 32.7 |  |  | $ | 258.2 |  |  | $ | 38.0 |
Weighted average common shares outstanding (in thousands) | 29,181 |  |  | 32,112 |  |  | 29,708 |  |  | 32,159 |
Common equivalent shares: |  |  |  |  |  |  |
Dilutive share-based awards | 314 |  |  | 216 |  |  | 310 |  |  | 213 |
Weighted average common shares outstanding - assuming dilution (in thousands) | 29,495 |  |  | 32,328 |  |  | 30,018 |  |  | 32,372 |
Earnings per common share assuming dilution | $ | 5.73 |  |  | $ | 1.01 |  |  | $ | 8.60 |  |  | $ | 1.18 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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