Accumulated Other Comprehensive Income (Loss) - Net Changes in Accumulated OCI by Component, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,353.4	$ 3,217.8	$ 3,430.8	$ 3,118.6
Other comprehensive (loss) income before reclassifications	89.2	(8.4)	(18.8)	(0.8)
Amounts reclassified from Accumulated OCI	6.3	4.1	12.3	8.2
Net other comprehensive income	95.5	(4.3)	(6.5)	7.4
Ending balance	3,508.6	3,308.7	3,508.6	3,308.7
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			3,424.7	3,118.6
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(295.4)	(170.3)	(187.4)	(177.9)
Other comprehensive (loss) income before reclassifications	87.8	(8.4)	(20.2)	(0.8)
Amounts reclassified from Accumulated OCI	0.0	0.0	0.0	0.0
Net other comprehensive income	87.8	(8.4)	(20.2)	(0.8)
Ending balance	(207.6)	(178.7)	(207.6)	(178.7)
Foreign Currency Translation | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(177.9)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	10.3	11.8	10.7	12.2
Other comprehensive (loss) income before reclassifications	1.4	0.0	1.4	0.0
Amounts reclassified from Accumulated OCI	(0.4)	(0.3)	(0.8)	(0.7)
Net other comprehensive income	1.0	(0.3)	0.6	(0.7)
Ending balance	11.3	11.5	11.3	11.5
Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				12.2
Defined Benefit Pension and Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(324.8)	(337.9)	(331.2)	(296.5)
Other comprehensive (loss) income before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from Accumulated OCI	6.7	4.4	13.1	8.9
Net other comprehensive income	6.7	4.4	13.1	8.9
Ending balance	(318.1)	(333.5)	(318.1)	(333.5)
Defined Benefit Pension and Postretirement Plans | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(45.9)
Defined Benefit Pension and Postretirement Plans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(342.4)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(609.9)	(496.4)	(507.9)	(462.2)
Net other comprehensive income	95.5	(4.3)	(6.5)	7.4
Ending balance	$ (514.4)	$ (500.7)	(514.4)	(500.7)
Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(45.9)
Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(45.9)
Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (507.9)	$ (508.1)