Earnings per share (Tables)

12 Months Ended

Dec. 31, 2018

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):

	2018			2017			2016
Numerator:
Basic and diluted:
Net income from continuing operations	$	375.9		$	586.0		$	558.4
Net (loss) income from discontinued operations		(185.5	)		(158.9	)		8.7
Net income attributable to controlling interest		190.4			427.1			567.1
Participating share awards with dividend equivalent rights		0.0			0.0			—
Net income available to common shareholders		190.4			427.1			567.1
Earnings allocated to participating share awards 1)		0.0			0.0			—
Net income attributable to common shareholders	$	190.4		$	427.1		$	567.1
Denominator: 1)
Basic: Weighted average common stock		87.1			87.5			88.2
Add: Weighted average stock options/share awards		0.2			0.2			0.2
Diluted:		87.3			87.7			88.4
Basic EPS:
Continuing operations	$	4.32		$	6.70		$	6.33
Discontinued operations		(2.13	)		(1.82	)		0.10
Basic EPS	$	2.19		$	4.88		$	6.43
Diluted EPS:
Continuing operations	$	4.31		$	6.68		$	6.32
Discontinued operations		(2.13	)		(1.81	)		0.10
Diluted EPS	$	2.18		$	4.87		$	6.42

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.