Earnings Per Share Computations (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Calculation of earnings per share

A reconciliation of basic and diluted earnings per share is below: 

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share amounts)	2018		2017		2018		2017
Numerator
Net income	$	57.5	$	55.6	$	151.8	$	134.7
Denominator
Weighted average common shares outstanding — basic	91.0		90.9		91.0		91.8
Dilutive shares	0.6		0.3		0.3		0.3
Weighted average common and common equivalent shares outstanding — diluted	91.6		91.2		91.3		92.1
Per common share income
Basic	$	0.63	$	0.61	$	1.66	$	1.47
Diluted	$	0.63	$	0.61	$	1.66	$	1.46