Accumulated Other Comprehensive Income (Loss) - Net Changes in Accumulated OCI by Component, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,508.6	$ 3,308.7	$ 3,430.8	$ 3,118.6
Other comprehensive income (loss) before reclassifications	42.6	(47.3)	23.8	(48.1)
Amounts reclassified from Accumulated OCI	6.2	4.1	18.5	12.3
Net other comprehensive income (loss)	48.8	(43.2)	42.3	(35.8)
Ending balance	3,640.8	3,325.2	3,640.8	3,325.2
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	(207.6)	(178.7)	(187.4)	(177.9)
Other comprehensive income (loss) before reclassifications	42.6	(47.3)	22.4	(48.1)
Amounts reclassified from Accumulated OCI	0.0	0.0	0.0	0.0
Net other comprehensive income (loss)	42.6	(47.3)	22.4	(48.1)
Ending balance	(165.0)	(226.0)	(165.0)	(226.0)
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	11.3	11.5	10.7	12.2
Other comprehensive income (loss) before reclassifications	0.0	0.0	1.4	0.0
Amounts reclassified from Accumulated OCI	(0.4)	(0.4)	(1.2)	(1.1)
Net other comprehensive income (loss)	(0.4)	(0.4)	0.2	(1.1)
Ending balance	10.9	11.1	10.9	11.1
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	(318.1)	(333.5)	(331.2)	(296.5)
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from Accumulated OCI	6.6	4.5	19.7	13.4
Net other comprehensive income (loss)	6.6	4.5	19.7	13.4
Ending balance	(311.5)	(329.0)	(311.5)	(329.0)
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 Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(514.4)	(500.7)	(507.9)	(462.2)
Net other comprehensive income (loss)	48.8	(43.2)	42.3	(35.8)
Ending balance	$ (465.6)	$ (543.9)	(465.6)	(543.9)
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(45.9)
Accumulated Other Comprehensive Income (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 Income (Loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (507.9)	$ (508.1)