Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Gains on cash flow hedges:
Interest expense	$ (13.4)	$ (12.4)	$ (24.8)	$ (24.9)
Amortization of net unrecognized losses and prior service credits	2.0	2.1	3.5	3.6
Income tax expense	(31.9)	(55.6)	(75.8)	(112.5)
Net earnings	105.9	184.9	247.9	367.0
Reclassification out of AOCI
Gains on cash flow hedges:
Net earnings	(6.3)	(4.1)	(12.3)	(8.2)
Cash Flow Hedges | Reclassification out of AOCI
Gains on cash flow hedges:
Interest expense	0.4	0.3	0.8	0.7
Income tax expense	0.0	0.0	0.0	0.0
Net earnings	0.4	0.3	0.8	0.7
Defined Benefit Pension and Postretirement Plans | Reclassification out of AOCI
Gains on cash flow hedges:
Amortization of net unrecognized losses and prior service credits	(8.8)	(5.9)	(17.2)	(11.7)
Income tax expense	2.1	1.5	4.1	2.8
Net earnings	$ (6.7)	$ (4.4)	$ (13.1)	$ (8.9)