Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge contract period, minimum	3 months
Cash flow hedge contract period, maximum	15 months
Gain (loss) on derivatives used in hedging transactions, net of tax	$ 5.6	$ 2.4	$ (0.5)
Net cash impact from hedging activity	4.6	3.2	2.1
Net accrued gain/(loss) on outstanding derivative instruments	4.7	1.1	(2.6)
Fair value hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain from forward points on fair value hedges	10.3	11.1	10.3
Cash flow hedging relationships | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Deferred gain/(loss) on cash flow hedges	7.8	2.2	(0.2)
Gain (loss) on derivatives used in hedging transactions, net of tax	5.6	2.4	(0.4)
Cash flow hedging relationships | Foreign exchange contracts | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivatives (ineffective portion and amounts excluded from effectiveness testing)	(4.9)	(2.9)	(2.5)
Net equity hedging relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives used in hedging transactions, net of tax	25.5	13.3	(8.9)
Net equity hedging relationships | Foreign exchange contracts | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in income on derivatives (ineffective portion and amounts excluded from effectiveness testing)	$ (13.3)	$ (13.2)	$ (12.9)