Earnings per share (Tables)

3 Months Ended

Mar. 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:

(In millions, except per share amounts)	Three months ended
	March 31, 2018		March 31, 2017
Numerator:
Basic and diluted:
Net income attributable to controlling interest	$	126.7	$	143.9
Participating share awards with dividend equivalent rights		—		—
Net income available to common shareholders		126.7		143.9
Earnings allocated to participating share awards 1)		—		(0.1	)
Net income attributable to common shareholders	$	126.7	$	143.8
Denominator: 1)
Basic: Weighted average common stock		87.0		88.3
Add: Weighted average stock options/share awards		0.3		0.2
Diluted:		87.3		88.5
Basic EPS	$	1.46	$	1.63
Diluted EPS	$	1.45	$	1.62