The following table sets forth the computation of basic and diluted loss per share:

In millions, except per share data
	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Numerator:
Net loss attributable to Stericycle, Inc. common shareholders	$	(4.5	)	$	(30.5	)	$	(24.6	)	$	(68.3	)
Numerator for basic loss per share attributable to Stericycle, Inc. common shareholders	$	(4.5	)	$	(30.5	)	$	(24.6	)	$	(68.3	)
Denominator:
Denominator for basic loss per share - weighted average shares		91.4			91.0			91.4			90.9
Effect of dilutive securities:
Denominator for diluted (loss) earnings per share - adjusted weighted average shares after assumed exercises		91.4			91.0			91.4			90.9
(Loss) earnings per share – Basic	$	(0.05	)	$	(0.33	)	$	(0.27	)	$	(0.75	)
(Loss) earnings per share – Diluted	$	(0.05	)	$	(0.33	)	$	(0.27	)	$	(0.75	)

In periods of net loss, options, RSUs, and PSUs are anti-dilutive and therefore excluded from the earnings per share calculation.

For the three and six months ended June 30, 2020, options to purchase shares (in thousands) of 3,258 and 3,538, respectively, were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

For the three and six months ended June 30, 2019, options to purchase shares (in thousands) of 4,632 and 4,754, respectively, were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

For the three and six months ended June 30, 2020, RSUs (in thousands) of 354 and 239, respectively, were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

For the three and six months ended June 30, 2019, RSUs (in thousands) of 308 and 394, respectively, were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

PSUs are offered to key employees and are subject to achievement of specified performance conditions. Contingently issuable shares are excluded from the computation of diluted earnings per share if, based on current period results, the shares would not be issuable if the end of the reporting period were the end of the contingency period. If such goals are not met, no compensation expense is recognized, and any previously recognized compensation expense is reversed.