Accumulated Other Comprehensive Income (Loss) (Changes in OCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014		Mar. 29, 2013		Dec. 27, 2013		Dec. 28, 2012
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	$ (5.2)	[1]	$ (13.3)	[1]	$ (3.4)	[1]	$ (24.9)	[1]
Other comprehensive income (loss) before reclassifications	(1.9)	[1]	11.8	[1]
Amounts reclassified from accumulated other comprehensive income (loss)	0.1	[1]	(0.2)	[1]
Net current period other comprehensive income (loss)	(1.8)	[1]	11.6	[1]
Net unrealized foreign currency translation gain (loss)	(0.6)		(9.2)
Changes in Fair Value of Effective Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	(4.9)	[1]	10.5	[1]	(3.1)	[1]	(13.4)	[1]
Other comprehensive income (loss) before reclassifications	(1.6)		22.3
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		1.6
Net current period other comprehensive income (loss)	(1.8)		23.9
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	11.5	[1]	1.1	[1]	12.0	[1]	10.6	[1]
Other comprehensive income (loss) before reclassifications	(0.5)		(9.5)
Amounts reclassified from accumulated other comprehensive income (loss)	0	[1]	0	[1]
Net current period other comprehensive income (loss)	(0.5)		(9.5)
Loss on intra-entity foreign currency translations	(0.6)		0.5
Net unrealized foreign currency translation gain (loss)	(0.1)		0.3
Retirement Benefit Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	(11.8)	[1]	(24.9)	[1]	(12.3)	[1]	(24.8)	[1]
Other comprehensive income (loss) before reclassifications	0.2	[1]	(0.6)	[1]
Amounts reclassified from accumulated other comprehensive income (loss)	0.3	[1]	0.5	[1]
Net current period other comprehensive income (loss)	0.5		(0.1)
Changes in Fair Value of Available for Sale Securities [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	0	[1]	0	[1]	0	[1]	2.7	[1]
Other comprehensive income (loss) before reclassifications	0	[1]	(0.4)	[1]
Amounts reclassified from accumulated other comprehensive income (loss)	0	[1]	(2.3)	[1]
Net current period other comprehensive income (loss)	$ 0		$ (2.7)

[1] All amounts are net of tax and noncontrolling interest.