Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Reconcilliation of Basic to Diluted Net Income Per Share

The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:

(in millions)	2018		2017		2016
Net income	$	206.9	$	150.7	$	143.6
Weighted average common shares outstanding	73.9		73.9		73.3
Dilutive effect of equity awards, based on the treasury stock method	1.5		1.9		1.7
Weighted average shares assuming dilution	75.4		75.8		75.0