Earnings per share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted EPS under Two-class Method

The computation of basic and diluted EPS under the two-class method were as follows (dollars and shares in millions):

	2022		2021		2020
Numerator: 1)
Net income attributable to common shareholders	$	423	$	435	$	187
Denominator: 1)
Basic weighted average common stock		87.1		87.5		87.3
Added: Weighted average stock options/share awards		0.2		0.2		0.2
Diluted weighted average common stock		87.2		87.7		87.5
Basic EPS	$	4.86	$	4.97	$	2.14
Diluted EPS	$	4.85	$	4.96	$	2.14

1) The Company’s unvested RSUs and PSs, of which some included the right to receive non-forfeitable dividend equivalents, are considered participating securities. Calculations of EPS under the two-class method exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities. The related participating securities are similarly excluded from the denominator. However, these participating securities have been immaterial for all the years presented.