Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Gains on cash flow hedges:
Interest expense	$ (13.8)	$ (12.0)	$ (38.6)	$ (36.9)
Income tax expense	(55.1)	(50.4)	(130.9)	(162.9)
Amortization of net unrecognized losses and prior service credits	2.8	2.8	6.3	6.4
Net earnings	184.7	169.2	432.6	536.2
Reclassification out of AOCI
Gains on cash flow hedges:
Net earnings	(6.2)	(4.1)	(18.5)	(12.3)
Cash Flow Hedges | Reclassification out of AOCI
Gains on cash flow hedges:
Interest expense	0.4	0.4	1.2	1.1
Income tax expense	0.0	0.0	0.0	0.0
Net earnings	0.4	0.4	1.2	1.1
Defined Benefit Pension and Postretirement Plans | Reclassification out of AOCI
Gains on cash flow hedges:
Income tax expense	2.1	1.4	6.2	4.2
Amortization of net unrecognized losses and prior service credits	(8.7)	(5.9)	(25.9)	(17.6)
Net earnings	$ (6.6)	$ (4.5)	$ (19.7)	$ (13.4)