Earnings Per Share

Basic earnings per share is computed based on the weighted-average number of common shares outstanding and diluted earnings per share is computed based on the weighted-average number of common shares outstanding adjusted by the number of additional shares that would have been outstanding had potentially dilutive common shares been issued. Potentially dilutive securities include nonvested share awards and stock options for which the exercise price was less than the average market price of our outstanding common stock. Nonvested performance-based share awards are included in the average diluted shares outstanding for each period if established performance criteria have been met at the end of the respective periods.

The following table sets forth the computation of basic and diluted earnings per share:



	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions, except per share data)	2017		2016		2017		2016
Numerator
Net income attributable to Global Brass and Copper Holdings, Inc.	$	12.4	$	3.9	$	45.5	$	24.5
Denominator
Weighted-average common shares outstanding	21.8		21.4		21.7		21.3
Effect of potentially dilutive securities:
Stock options and nonvested share awards	0.3		0.2		0.4		0.2
Weighted-average common shares outstanding, assuming dilution	22.1		21.6		22.1		21.5

Anti-dilutive shares excluded from above	0.2		0.1		0.2		0.1
Net income attributable to Global Brass and Copper Holdings, Inc. per common share:
Basic	$	0.57	$	0.18	$	2.10	$	1.15
Diluted	$	0.56	$	0.18	$	2.06	$	1.14