Earnings Per Share

12 Months Ended

Dec. 31, 2015

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 appropriately weighted shares issued or reacquired during the year for the portion of the year 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 for the years ending December 31 (in millions, except per share amounts):



	2015		2014		2013
Numerator:
Net income	$	205.3	$	205.0	$	169.3

Denominator:
Weighted average shares outstanding - basic	43.1		45.0		46.4
Effect of dilutive securities:
Equity compensation plans	0.7		0.8		0.7
Weighted average shares outstanding - diluted	43.8		45.8		47.1
Basic earnings per share	$	4.76	$	4.55	$	3.64
Diluted earnings per share	$	4.69	$	4.48	$	3.59