Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Gains on cash flow hedges:
Interest expense	$ (11.4)	$ (12.5)
Amortization of net unrecognized losses and prior service credits	1.5	1.5
Income tax expense	(43.9)	(56.9)
Net earnings	142.0	182.1
Reclassification out of AOCI
Gains on cash flow hedges:
Net earnings	(6.0)	(4.1)
Cash Flow Hedges | Reclassification out of AOCI
Gains on cash flow hedges:
Interest expense	0.4	0.4
Income tax expense	0.0	0.0
Net earnings	0.4	0.4
Defined Benefit Pension and Postretirement Plans | Reclassification out of AOCI
Gains on cash flow hedges:
Amortization of net unrecognized losses and prior service credits	(8.4)	(5.8)
Income tax expense	2.0	1.3
Net earnings	$ (6.4)	$ (4.5)