Commitments and Contingencies - Warranty (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of the period	$ 4.6	$ 1.9
Costs accrued and revenues deferred	0	0.4
Warranty liabilities assumed from acquisitions	1.2	0
Settlements made (in cash or kind) and revenues recognized	(0.7)	(0.4)
Balance at end of period	5.1	1.9
Less: Current portion	0	1.6
Noncurrent accrued product warranty and deferred warranty revenue	$ 5.1	$ 0.3
Product Warranties | Minimum
Warranty Coverage Period [Line Items]
Warranty coverage period	1 year
Product Warranties | Maximum
Warranty Coverage Period [Line Items]
Warranty coverage period	10 years