Diluted earnings (loss) per common share (“Diluted EPS”) takes into account the potential dilution that could occur if outstanding securities were exercised or settled in shares. Dilutive securities that may impact Diluted EPS include shares underlying outstanding stock options, RSUs and PRSUs granted to employees and non-employee directors (see Note 15), as well as common shares underlying the Convertible Notes (see Note 7). Dilutive securities related to shares underlying outstanding stock options, RSUs and PRSUs granted to employees and non-employee directors are included in the calculation of diluted earnings per common share using the treasury stock method. Dilutive securities related to common shares underlying the Convertible Notes are included in the calculation of Diluted EPS using the if-converted method. Basic and diluted weighted-average common shares outstanding are the same in periods when a net loss is reported or in periods when anti-dilution occurs.


	Year Ended December 31,
	2025		2024		2023
Earnings (loss) per common share—basic
Numerator:
Net income (loss) from continuing operations	$	38.8	$	93.4	$	99.5
Income (loss) from discontinued operations, net of tax	(448.1)		(1,541.1)		(4.5)
Net income (loss)	$	(409.3)	$	(1,447.7)	$	95.0
Denominator:
Weighted-average common shares outstanding	183.7		183.7		185.0
Basic earnings (loss) per common share:
Continuing operations	$	0.21	$	0.51	$	0.54
Discontinued operations	$	(2.44)	$	(8.39)	$	(0.02)
Net earnings (loss) per common share	$	(2.23)	$	(7.88)	$	0.51
Earnings (loss) per common share—diluted
Numerator:
Net income (loss) from continuing operations	$	38.8	$	93.4	$	99.5
Add: Interest expense attributable to convertible notes, net of tax	—		6.5		6.5
Income (loss) from continuing operations and assumed conversions	38.8		99.9		106.0
Loss from discontinued operations, net of tax	(448.1)		(1,541.1)		(4.5)
Net (loss) income attributable to earnings per common share	$	(409.3)	$	(1,441.2)	$	101.5
Denominator:
Weighted-average common shares outstanding—basic	183.7		183.7		185.0
Incremental shares for assumed conversion of Convertible Notes	—		14.7		14.7
Outstanding options, restricted stock units and performance share units	2.0		0.9		1.4
Weighted-average common shares outstanding—diluted	185.7		199.3		201.1
Diluted earnings (loss) per common share:
Continuing operations	$	0.21	$	0.50	$	0.53
Discontinued operations	$	(2.41)	$	(7.73)	$	(0.02)
Net diluted earnings (loss) per common share	$	(2.20)	$	(7.23)	$	0.50

For the year ended December 31, 2025, approximately 16.7 million securities outstanding comprised of shares subject to conversion from the Convertible Notes, stock options, restricted stock units and performance share units, were excluded from the calculation of Diluted EPS, as they would be anti-dilutive. For the years ended December 31, 2024 and 2023, approximately 2.5 million and 2.3 million securities outstanding, respectively, comprised of stock options, restricted stock units and performance share units, were excluded from the calculation of Diluted EPS, as they would be anti-dilutive.