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Earnings Per Share (Tables)

12 Months Ended

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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- References

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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

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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

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