Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 03, 2011	Jul. 03, 2011
Restructuring liability [Roll Forward]
Reduction in workforce (in numer of employees)		250
Year 2007 Restructuring Program [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		$ 1.3
Additional Provisions (Reversals)		0.7
Cash expenditures	0.9	(1.2)
Balance, end of period	0.8	0.8
Year 2007 Restructuring Program [Member] | Contract Termination Costs [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		1.3
Additional Provisions (Reversals)		(0.2)
Cash expenditures		(0.3)
Balance, end of period	0.8	0.8
Year 2007 Restructuring Program [Member] | Other Exit Costs [Member]
Restructuring liability [Roll Forward]
Additional Provisions (Reversals)		0.9
Cash expenditures		(0.9)
Year 2009 Restructuring Program [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		2.0
Additional Provisions (Reversals)		(0.3)
Cash expenditures		(0.5)
Balance, end of period	1.2	1.2
Reduction in workforce (in numer of employees)		200
Year 2009 Restructuring Program [Member] | Employee Severance and Other Employee Benefits [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		2.0
Additional Provisions (Reversals)		(0.3)
Cash expenditures		(0.5)
Balance, end of period	1.2	1.2
Other Restructuring Program [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		0.1
Additional Provisions (Reversals)		(0.1)
Cash expenditures		0
Balance, end of period	0	0
Other Restructuring Program [Member] | Employee Severance and Other Employee Benefits [Member]
Restructuring liability [Roll Forward]
Balance, beginning of period		0.1
Additional Provisions (Reversals)		(0.1)
Cash expenditures		0
Balance, end of period	$ 0	$ 0