Earnings per share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of computation of net income per share

The computation of net income per share is presented below:

	Three months ended
(dollars in millions, except share numbers and per share amounts)	March 31, 2018		April 1, 2017
Net income attributable to shareholders	$	24.2	$	18.8
Weighted average number of shares outstanding	274,876,458		245,603,089
Dilutive effect of share-based awards (number of shares)	9,427,991		4,285,142
Diluted weighted average number of shares outstanding	284,304,449		249,888,231
Basic net income per share	$	0.09	$	0.08
Diluted net income per share	$	0.09	$	0.08