Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014	Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (452.5)	$ (309.5)	$ (452.5)	$ (309.5)	$ (408.7)	$ (316.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(38.7)	9.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(5.1)	(1.8)
Other Comprehensive Income (Loss), Net of Tax	(21.1)	6.4	(43.8)	7.3
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges, before tax			8.5	3.2
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges, tax			(1.9)	(0.7)
Amounts reclassified from accumulated other comprehensive loss, pension and other post-retirement items, prior service benefit, before tax			0.6	0.4
Amounts reclassified from accumulated other comprehensive loss, pension and other post-retirement items, actuarial losses, before tax			(2.1)	(1.3)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax			(0.4)	0.0
Amounts reclassified from accumulated other comprehensive loss, pension and other post-retirement items, tax			0.4	0.2
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(412.9)	(276.7)	(412.9)	(276.7)	(368.3)	(283.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(44.6)	6.4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0.0	0.0
Other Comprehensive Income (Loss), Net of Tax			(44.6)	6.4
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	5.6	2.3	5.6	2.3	7.8	2.2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			4.4	2.6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(6.6)	(2.5)
Other Comprehensive Income (Loss), Net of Tax			(2.2)	0.1
Pension and Other Post-retirement Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (45.2)	$ (35.1)	(45.2)	(35.1)	$ (48.2)	$ (35.9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			1.5	0.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			1.5	0.7
Other Comprehensive Income (Loss), Net of Tax			$ 3.0	$ 0.8