Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earning Per Shares

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