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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

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 months ended March 31, 2021 and 2020:

									Three Months Ended March 31,
(Millions of dollars, except share and per share amounts)															2021						2020
Earnings per common share:
Net income per share - basic
Net income attributable to common stockholders															$	55.3					$	89.3
Weighted average common shares outstanding (in thousands)															27,131						30,235
Earnings per common share															$	2.04					$	2.95

Earnings per common share - assuming dilution:
Net income per share - diluted
Net income attributable to common stockholders															$	55.3					$	89.3
Weighted average common shares outstanding (in thousands)															27,131						30,235
Common equivalent shares:
Dilutive share-based awards															357						306
Weighted average common shares outstanding - assuming dilution (in thousands)															27,488						30,541
Earnings per common share assuming dilution															$	2.01					$	2.92

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 reported in the table below.

									Three Months Ended March 31,
Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive															2021						2020
Stock Options															81,300						75,600
Restricted share units															20,491						70,887
Total anti-dilutive shares															101,791						146,487

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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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