Earnings Per Share

9 Months Ended

Sep. 30, 2017

Earnings per Share

We compute basic earnings per share by dividing net income available to our common shareholders by the weighted average number of shares of our common stock outstanding. We weighted shares issued or reacquired during the period for the portion of the period that they were outstanding. Our diluted earnings per share reflect the impacts of our potentially dilutive securities, which include our equity compensation awards.

The following table shows the computation of our basic and diluted net income per common share (in millions, except per share amounts):



	Three Months Ended September 30				Nine Months Ended September 30
	2017		2016		2017		2016
Numerator:
Net income	$	49.0	$	95.7	$	159.9	$	226.2

Denominator:
Weighted average shares outstanding - basic	38.6		40.1		39.0		40.7
Effect of dilutive securities:
Equity compensation plans	0.6		0.5		0.6		0.5
Weighted average shares outstanding - diluted	39.2		40.6		39.6		41.2
Basic earnings per share	$	1.27	$	2.39	$	4.10	$	5.55
Diluted earnings per share	$	1.25	$	2.36	$	4.04	$	5.49