Earnings per share (Tables)

9 Months Ended

Sep. 30, 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:

(In millions, except per share amounts)	Three months ended					Nine months ended
	September 30, 2018		September 30, 2017			September 30, 2018			September 30, 2017
Numerator:
Basic and diluted:
Net income from continuing operations		117.5		105.7			468.9			389.3
Net income from discontinued operations		—		(14.9	)		(187.5	)		(24.8	)
Net income attributable to controlling interest	$	117.5	$	90.8		$	281.4		$	364.5
Participating share awards with dividend    equivalent rights		—		—			—			—
Net income available to common shareholders		117.5		90.8			281.4			364.5
Earnings allocated to participating share awards		—		—			—			—
Net income attributable to common shareholders	$	117.5	$	90.8		$	281.4		$	364.5
Denominator:
Basic: Weighted average common stock		87.1		86.9			87.1			87.7
Add: Weighted average stock options/share    awards		0.3		0.3			0.2			0.2
Diluted:		87.4		87.2			87.3			87.9
Basic EPS:
Continuing operations	$	1.35	$	1.22		$	5.38		$	4.44
Discontinued operations	$	—	$	(0.17	)	$	(2.15	)	$	(0.28	)
Basic EPS	$	1.35	$	1.05		$	3.23		$	4.16
Diluted EPS:
Continuing operations	$	1.34	$	1.21		$	5.37		$	4.43
Discontinued operations	$	—	$	(0.17	)	$	(2.15	)	$	(0.28	)
Diluted EPS	$	1.34	$	1.04		$	3.22		$	4.15