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Derivative Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 27, 2014
Dec. 28, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Net derivative gains (losses) on closed hedge instruments in AOCI that will be realized in earnings when the hedged items impact earnings $ 0.6 $ (0.7)
Notional amount of receive-variable/pay-fixed interest rate swaps 100.0  
Receive-variable/pay-fixed interest rate swaps, maturity period August 2017  
Net AOCI balance (9.3)  
Net current deferred gains expected to be realized $ (5.0)