Earnings per share (Tables)

12 Months Ended

Dec. 31, 2021

Basic and diluted earnings per share were calculated as follows:


	Years ended December 31,
In millions except share and per-share data	2021		2020		2019
Basic earnings:
Net income from continuing operations	$	30.0	$	20.8	$	8.7
Net gain / (loss) from discontinued operations	(0.1)		(0.8)		(5.6)
Net income	$	29.9	$	20.0	$	3.1

Weighted average number of £0.50 ordinary shares:
For basic earnings per share	27,698,691		27,557,219		27,289,042
Dilutive effect of potential common stock	333,815		414,163		593,822
For diluted earnings per share	28,032,506		27,971,382		27,882,864

Earnings per share using weighted average number of ordinary shares outstanding:(1)
Basic earnings per ordinary share for continuing operations	$	1.08	$	0.75	$	0.32
Basic earnings / (loss) per ordinary share for discontinued operations	$	—	$	(0.03)	$	(0.21)
Basic earnings per ordinary share	$	1.08	$	0.73	$	0.11

Diluted earnings per ordinary share for continuing activities	$	1.07	$	0.74	$	0.31
Diluted earnings / (loss) per ordinary share for discontinued operations	$	—	$	(0.03)	$	(0.21)
Diluted earnings per ordinary share	$	1.07	$	0.72	$	0.11

(1) The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular year may not equal the earnings-per-share amount in total.