Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

Summary of changes in stockholders' equity

A summary of the changes in stockholders’ equity is provided below (in millions):

	Nine Months Ended			Nine Months Ended
	September 25, 2011			September 30, 2012
Stockholders’ equity at beginning of period	$	169.9		$	312.6
Comprehensive income:
Net loss	(15.6		)	(24.4		)
Foreign currency translation	0.1			(0.4		)
Total comprehensive loss	(15.5		)	(24.8		)
Additional paid-in-capital from the issuance of common stock for cash	61.1			97.0
Additional paid-in-capital from the issuance of common stock in connection with acquisitions	—			23.8
Stock-based compensation	2.3			4.6
Restricted stock units traded for taxes	(0.1		)	(0.2		)
Employee stock purchase plan and restricted stock units settled in cash	0.9			(0.4		)
Exercise of stock options and warrants	1.2			—
Fair value of stock options assumed in acquisitions	111.6			—
Stockholders’ equity at end of period	$	331.4		$	412.6

Rollforward of common stock outstanding

Common stock issued by the Company for the nine months ended September 25, 2011 and September 30, 2012 was as follows (in millions):

	Nine Months Ended	Nine Months Ended
	September 25, 2011	September 30, 2012
Shares outstanding at beginning of the period	18.6	32.4
Stock issued for employee stock purchase plan, stock options and restricted stock units exercised	0.4	0.1
Common stock issued for acquisitions	10.4	4.0
Redemption of Series B Convertible Preferred Stock	0.1	—
Common stock issued for cash	4.9	20.0
Shares outstanding at end of the period	34.4	56.5