Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Dec. 31, 2011
Derivative Instruments (Textual) [Abstract]
Total fair value of derivative liabilities	$ 2.3		$ 2.3		$ 3.0
Cash Flow Hedging [Member]
Derivative Instruments (Textual) [Abstract]
Total notional value of the Company's outstanding forward contracts, designated as foreign-currency cash-flow hedges	36.5		36.5		36.9
Maturity period of forward contract			within 12 months
Period to calculate and evaluate the effectiveness of each hedge			Quarterly
Other Foreign Currency Hedges [Member]
Derivative Instruments (Textual) [Abstract]
Total notional value of the Company's outstanding forward contracts, not designated as hedges under hedge accounting	35.3		35.3		37.6
(Loss)/gain related to other foreign-currency hedges	$ (2.9)	$ 0.3	$ (1.7)	$ 2.1
Maturity period of forward contract			within 3 months