Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 26, 2021	Mar. 27, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020	Dec. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (676.4)		$ (703.5)		$ (676.4)	$ (703.5)	$ (685.9)	$ (638.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					7.9	(64.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					1.6	(0.4)
Other comprehensive income (loss)	4.2	$ 5.3	16.3	$ (81.5)	9.5	(65.2)
Gain (Loss) Reclassification Adjustment From AOCI On Derivatives Before Tax					0.0	(2.5)
Gain (Loss) Reclassification Adjustment From AOCI On Derivatives, Tax					0.0	0.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax					(0.3)	(0.1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax					1.4	0.4
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax					1.7	0.9
Amounts reclassified from accumulated other comprehensive loss, pension and other post-retirement items, tax					(1.2)	0.4
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(641.1)		(671.0)		(641.1)	(671.0)	(648.4)	(600.2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					7.3	(70.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0.0	0.0
Other comprehensive income (loss)					7.3	(70.8)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0.3		2.1		0.3	2.1	0.2	(2.4)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					0.1	6.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0.0	(2.0)
Other comprehensive income (loss)					0.1	4.5
Pension and Other Post-retirement Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (35.6)		$ (34.6)		(35.6)	(34.6)	$ (37.7)	$ (35.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax					0.5	(0.5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					1.6	1.6
Other comprehensive income (loss)					$ 2.1	$ 1.1