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Net income (loss) per common share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Schedule of Net Income Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted net income (loss) per common share:

			Year Ended December 31,
			2023						2022						2021
Numerator:
Net income (loss)			$	(760.5)					$	(211.6)					$	219.5
Denominator:
Weighted-average number of shares-basic			51.2						50.1						53.5
Dilutive effect of employee incentive plans			—						—						0.6
Weighted-average number of shares-diluted			51.2						50.1						54.1
Net income (loss) per common share - basic			$	(14.85)					$	(4.22)					$	4.10
Net income (loss) per common share - diluted			$	(14.85)					$	(4.22)					$	4.06

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the share-based awards that are not considered in the diluted net income (loss) per common share calculation generally because the exercise price of the awards was greater than the average per share closing price during the year ending December 31, 2023, 2022 and 2021. In certain instances, awards may be anti-dilutive even if the average market price exceeds the exercise price when the sum of the assumed proceeds exceeds the difference between the market price and the exercise price.

			Year Ended December 31,
			2023						2022						2021
Anti-dilutive stock awards			3.6						2.8						1.0

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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
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
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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
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
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