Acquisitions - Pro Forma Financial Information, Nonrecurring Adjustments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	$ (4.2)	$ (6.9)	$ (24.4)	$ (15.6)
Acquisition-related expenses
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma		3.7	2.7	11.3
Intangible amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma		6.0	12.1	28.0
Net change in stock compensation expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma		2.2	2.2	(1.4)
Net change in interest expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma		1.3	0	11.3
Net change in income tax benefit (expense)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma		$ (0.2)	$ 0	$ (0.1)
Increase in weighted average common shares outstanding for shares issued and not already included in the weighted average common shares outstanding
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Weighted average number of basic shares outstanding adjustment, pro forma		27.5	12.7	32.9