Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative losses on closed hedge instruments in AOCI that will be realized in earnings when the hedged items impact earnings	$ (2.0)	$ (7.5)
AOCI balance related to hedging activities	8.6
Net current deferred gains (losses) expected to be realized	$ 11.0
Receive-Variable/Pay-Fixed Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative		$ 100.0